Behold I do not give lectures or a little charity, When I give I give myself.
— Walt Whitman

Go into the street, and give one man a lecture on morality, and another a shilling, and see which will respect you most.
Samuel Johnson lecture quote

After listening to a lecture on evolution by a science professor, a student wrote a poem and titled it The Amazing Professor. The poem read: Once I was a tadpole when I began to begin. Then I was a frog with my tail tucked in. Next I was a monkey on a coconut tree. Now I am a doctor with a Ph.D.
— Unknown

He that knows himself, knows others; and he that is ignorant of himself, could not write a very profound lecture on other men's heads.
— Charles Caleb Colton

People who get through life dependent on other people's possessions are always the first to lecture you on how little possessions count.
— lecture quotation by Ben Elton