To be enthusiastic about something, and to attempt to share that enthusiasm with others; to promote.
To preach any ideology to those who have not yet been converted to it.
Coordinate term: proselytize
To tell people about (a particular branch of) Christianity, especially in order to convert them; to preach the gospel to.
Hypernym: proselytize
To cause (someone) to learn or understand (something).
To pass on knowledge generally, especially as one's profession; to act as a teacher.
To pass on knowledge to.
To cause to know the disagreeable consequences of some action.
teacher