Better be wise by the misfortunes of others than by your own.
You will only injure yourself if you take notice of despicable enemies.
Each person has his strong point.
If you had half as much brains as you have beard, you would have looked before you leaped.
Look and see which way the wind blows before you commit yourself.
It is one thing to say that something should be done, but quite a different matter to do it.