Sometimes we view conflict only in negative terms, and that's a terrible intellectual mistake. Here are three quotes to emphasize that critical point.

Have you learned lessons only of those who admired you, and were tender with you, and stood aside for you? Have you not learned great lessons from those who braced themselves against you, and disputed the passage with you?
Walt Whitman - American poet

Cannot we let people be themselves, and enjoy life in their own way?
Ralph Waldo Emerson - American writer

No one is as deaf as the man who will not listen. - Jewish saying

If a man's best friend is a dog, his worse is a dogma. - Leo Rosten - American writer