I like this quote, although it is attributed to several sources, depending on your reference.
"Resolve to be tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and the wrong. Sometime in life you will have been all of these."
"Resolve to be tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and the wrong. Sometime in life you will have been all of these."