Perhaps the reason why you have not accomplished so much in the field of teaching, is the extent you looked upon your own weaknesses and inabilities to spread the Message.
Bahá’u’lláh and the Master have both urged us repeatedly to disregard our own handicaps and lay our whole reliance upon God. He will come to our help if we only arise and become active channel for God’s grace.
Do you think it is the teachers who make converts and change human hearts? No, surely not. They are only pure souls who take the first step, and then let the spirit of Bahá’u’lláh move them and make use of them. If any of them should even for a second consider his achievements as due to his own capacities, his work is ended and his fall starts.
This is in fact why so many competent souls have after wonderful services suddenly found themselves absolutely impotent and perhaps thrown aside by the Spirit of the Cause as useless souls.
The criterion is the extent to which we are ready to have the will of God operate through us. Stop being conscious of your frailties, therefore; have a perfect reliance upon God; let your heart burn with the desire to serve His Mission and proclaim His call; and you will observe how eloquence and the power to change human hearts will come as a matter of course. ... In fact the mere act of arising will win for you God’s help and blessings.
~ Shoghi Effendi
Source: From a letter dated March 31, 1932 to an Individual believer. The Power of Divine Assistance, #65. © Bahá'í International Community. Bahá’u’lláh has said that God will assist those who arise in His service. The more you labour for this Faith, the more He will aid and bless you.
~ Shoghi Effendi
Source: From a letter dated Nov. 23, 1941, to the Bahá’ís of Quito, Ecuador. #72, The Power of Divine Assistance. © Bahá'í International Community. Here is the link to Bahá'í Ebooks
, where the compilation may be downloaded.