Although forbidden by Bahá'u'lláh from aggressive proselytizing, Bahá'ís believe that His message offers specific and important answers to the diverse and grave problems facing humanity. Accordingly, they are eager to share this message with anyone who expresses an interest.

Sharing Bahá'u'lláh's vision is known as "teaching" in Bahá'í terminology. Teaching can take many forms. Someone who wants to know more about the Faith might be invited to a "fireside." Firesides are informal gatherings in the homes of Bahá'ís. Short talks on Bahá'í principles are presented and discussion follows. Light refreshments are often served, and the gatherings are notable for their warm and hospitable atmosphere.

Bahá'ís also endeavor to spread the Faith by moving into areas where there are few Bahá'ís. This is known as "pioneering." This differs sharply from traditional missionary work in that pioneers are generally expected to be self-supporting. They become part of their new community in all aspects: by working there, participating in community activities, and supporting the local government and its institutions.

Bahá'í communities sometimes also hold large public meetings, buy advertising, or seek media coverage in order to share more widely the principles of Bahá'u'lláh's message.