Hansome is as hansome does

"Hansome is as hansome does."
"Hang a thief when he's young,and he'll no' steal when he's old."
"Hard cases make bad law."
"Hard words break no bones."
"Haste makes waste."
欲速则不达（过于性急反而不能达到目的）

Handsome is as handsome does人不可貌相,海水不可斗量!

欲速则不达