Noun
One who teaches or instructs; one whose business or occupation is to instruct others; an instructor; a tutor.
One who instructs others in religion; a preacher; a minister of the gospel; sometimes, one who preaches without regular ordination.
Source: Webster's dictionaryI am indebted to my father for living, but to my teacher for living well. Alexander the Great
The best teacher is experience. It charges a high price, but explains things well! Source: Internet
Experience is the teacher of all things. Julius Caesar
A teacher is better than two books. German Proverb
The fault of another is a good teacher. German Proverb
Experience is the greatest teacher. Pakistani Proverb