Rashness succeeds often, still more often fails.
Angry people are not always wise.
The hastening of any undertaking begets error, from which great losses are wont to come.
Impulsiveness can be charming but deliberation can have an appeal, as well.
When you don't know what you're doing, it's best to do it quickly.
I've always been able to make erroneous decisions very quickly.
Too great haste leads us to error.
The thinking of the world leads us to think shallowly and act too quickly.
I think the two things most opposed to good counsel are haste and passion; haste usaully goes hand in hand with folly, passion with coarseness and narrowness of mind.
If you think something's stupid, it probably is.