It is true that Baha'u'llah lays on every Baha'i the duty to teach His Faith. At the same time, however, we are forbidden to proselytize, so it is important for all believers to understand the difference between teaching and proselytizing. It is a significant difference and, in some countries where teaching a religion is permitted, but proselytizing is forbidden, the distinction is made in the law of the land. Proselytizing implies bringing undue pressure to bear upon someone to change his Faith. It is also usually understood to imply the making of threats or the offering of material benefits as an inducement to conversion. In some countries mission schools or hospitals, for all the good they do, are regarded with suspicion and even aversion by the local authorities because they are considered to be material inducements to conversion and hence instruments of proselytization (16:1)

Baha'u'llah, in The Hidden Words, says, "O Son of Dust! The wise are they that speak not unless they obtain a hearing, even as the cup-bearer, who proffereth not his cup till he findeth a seeker, and the lover who crieth not out from the depths of his heart until he gazeth upon the beauty of his beloved ... ", and on page 55 of The Advent of Divine Justice, a letter which is primarily directed towards exhorting the friends to fulfil their responsibilities in teaching the Faith, Shoghi Effendi writes: "Care, however, should, at all times, be exercised, lest in their eagerness to further the international interests of the Faith they frustrate their purpose, and turn away, through any act that might be misconstrued as an attempt to proselytize and bring undue pressure upon them, those whom they wish to win over to their Cause." Some Baha'is sometimes overstep the proper bounds, but this does not alter the clear principle (16:2)

The responsibility of the Baha'is to teach the Faith is very great. The contraction of the world and the onward rush of events require us to seize every chance open to us to touch the hearts and minds of our fellowmen. The Message of Baha'u'llah is God's guidance for mankind to overcome the difficulties of this age of transition and move forward into the next stage of its evolution, and human beings have the right to hear it. Those who accept it incur the duty of passing it on to their fellowman. The slowness of the response of the world has caused and is causing great suffering; hence the historical pressure upon Baha'is to exert every effort to teach the Faith for the sake of their fellowmen. They should teach with enthusiasm, conviction, wisdom and courtesy, but without pressing their hearer, bearing in mind the words of Baha'u'llah: "Beware lest ye contend with any one, nay, strive to make him aware of the truth with kindly manner and most convincing exhortation. If your hearer respond, he will have responded to his own behoof, and if not, turn ye away from him, and set your faces towards God's sacred Court, the seat of resplendent holiness." (gwb 278) (UHJ 1982 Jan 03, Teaching vs. Proselytizing) (16:3)

End of Quote

Teaching Advice
Various Sources