Whosoever and whatsoever meeting becometh a hindrance to the diffusion of the Light of Faith, let the loved ones give them counsel and say: “Of all the gifts of God the greatest is the gift of Teaching. It draweth unto us the Grace of God and is our first obligation. Of such a gift how can we deprive ourselves? Nay, our lives, our goods, our comforts, our rest, we offer them all as a sacrifice for the Abha Beauty and teach the Cause of God.” Caution and prudence, however, must be observed even as recorded in the Book. The veil must in no wise be suddenly rent asunder. The Glory of Glories rest upon you.
— ‘Abdu’l-Baha, The Baha’i World Faith.  1976: 448-449
If you are mass teaching or a member of a teaching team, look happy but avoid unnecessary joking and games, learn from the mistakes and good qualities of others and consult together on what you are going to do each day.
“For whatever convulsions the waywardness of a godless and materialistic age may yet precipitate in the world, however grievous may be the effects of the rolling up of the present order on the plans and efforts of the community of the Most Great Name, we must seize the opportunities of the hour and go forward confident that all things are within His mighty grasp and that, if we but play our part, total and unconditional victory will inevitably be ours.”
“Trust in God and Bahá’u’lláh, be detached and prepare yourself through prayer and deepening. ‘Whoso ariseth to teach Our Cause must needs detach himself from all earthly things, and regard, at all times, the triumph of Our Faith as his supreme objective…
And when he determineth to leave his home, for the sake of the Cause of his Lord, let him put his whole trust in God, as the best provision for his journey, and array himself with the robe of virtue.'”
— Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 334
“Intone, O My servant, the verses of God that have been received by thee…, that the sweetness of thy melody may kindle thine own soul, and attract the hearts of all men.”
— Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 295
“Whoso ariseth among you to teach the Cause of his Lord, let him, before all else, teach his own self, that his speech may attract the hearts of them that hear him. Unless he teacheth his own self, the words of his mouth will not influence the heart of the seeker.”
— Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 277
“It is known and clear that today the unseen divine assistance encompasseth those who deliver the Message. And if the work of delivering the Message be neglected, the assistance shall be entirely cut off, for it is impossible that the friends of God could receive assistance unless they be engaged in delivering the Message. Under all conditions the Message must be delivered, but with wisdom. If it be not possible openly, it must be done quietly. The friends should be engaged in educating the souls and should become instruments in aiding the world of humanity to acquire spiritual joy and fragrance. For example: If every one of the friends (believers) were to establish relations of friendship and right dealings with one of the negligent souls, associate and live with him with perfect kindliness, and meanwhile through good conduct and moral behavior lead him to divine instruction, to heavenly advice and teachings, surely he would gradually arouse that negligent person and would change his ignorance into knowledge.
“Souls are liable to estrangement. Such methods should be adopted that the estrangement should be first removed, then the Word will have effect.
“If one of the believers be kind to one of the negligent ones and with perfect love should gradually make him understand the reality of the Cause of God in such a way that the latter should know in what manner the Religion of God hath been founded and what its object is, doubtless he will become changed; excepting abnormal souls who are reduced to the state of ashes and whose hearts are like stones, yea, even harder.
“If by this method every one of the friends of God were to try to lead one soul to the right path, the number of the believers would be doubled every year. But this should be carried out with perfect wisdom and in such a manner that no harm would ever result therefrom.”
(“Tablets of Abdul-Bahá Abbas”, vol. 2, p. 391)
”If we acknowledge that there is a beginning for this world of creation, we acknowledge that the sovereignty of God is accidental—that is, we admit a time when the reality of Divinity has been without dominion (lit. “defeated”). The names and attributes of Divinity are requirements of this world. The names the Powerful, the Living, the Provider, the Creator require and necessitate the existence of creatures. If there were no creatures, Creator would be meaningless. If there were none to provide for, we could not think of the Provider. If there were no life, the Living would be beyond the power of conception. Therefore, all the names and attributes of God require the existence of objects or creatures upon which they have been bestowed and in which they have become manifest.”
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 218)
Be not dismayed, O peoples of the world, when the day star of My beauty is set, and the heaven of My tabernacle is concealed from your eyes. Arise to further My Cause, and to exalt My Word amongst men. We are with you at all times, and shall strengthen you through the power of truth. We are truly almighty. Whoso hath recognized Me, will arise and serve Me with such determination that the powers of earth and heaven shall be unable to defeat his purpose.
(Gleanings from the Writings of Bahá’u’lláh, pp. 136-37; Synopsis and Codification of the Laws and Ordinances of the Kitab-i-Aqdas, p.14) [Ed. – now translated in the Kitáb-i-Aqdas par 38.]
The field is indeed so immense, the period so critical, the Cause so great,the workers so few, the time so short, the privilege so priceless, that no follower of the Faith of Baha’u’llah, worthy to bear His name, can afford a moment’s hesitation.
That God-born Force, irresistible in its sweeping power, incalculable in its potency, unpredictable in its course, mysterious in its workings, and awe-inspiring in its manifestations –
– a Force which, as the Bab has written, “vibrates within the innermost being of all created things,” and which, according to Baha’u’llah, has through its “vibrating influence,” “upset the equilibrium of the world and revolutionized its ordered life”-
– such a Force, acting even as a two-edged sword, is, under our very eyes, sundering, on the one hand, the age-old ties which for centuries have held together the fabric of civilized society, and is unloosing, on the other, the bonds that still fetter the infant and as yet unemancipated Faith of Baha’u’llah.
The undreamt-of opportunities offered through the operation of this Force — the American believers must now rise, and fully and courageously exploit them.
“The holy realities of the Concourse on high,” writes ‘Abdu’l-Baha, “yearn, in this day, in the Most Exalted Paradise, to return unto this world, so that they may be aided to render some service to the threshold of the Abha Beauty, and arise to demonstrate their servitude to His sacred Threshold.”
(Shoghi Effendi, The Advent of Divine Justice, p. 46-47)