It was a favourite expression of Theophrastus that time was the most valuable thing that a man could spend.[762:3]
Theophrastus. x.
Antisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust.
Antisthenes. iv.
[[763]]
![[763]](#2001010581228339517_763.png.id-7014229135017592667.wrap-0.html.html){kind=link}
When he was praised by some wicked men, he said, "I am sadly afraid that I must have done some wicked thing."[763:1]
Antisthenes. iv.
When asked what learning was the most necessary, he said, "Not to unlearn what you have learned."
Antisthenes. iv.
Diogenes would frequently praise those who were about to marry, and yet did not marry.