I never view mistakes as failures. They are simply opportunities to find out what doesn't work.

A failure teaches you that something can't be done-that way.

If you punish people too much for failure, then they will respond accordingly and the innovation you will get will be very incrementalist. Nobody's going to try anything bold for fear of getting fired or punished in some way. The risk/reward must be balanced, in favor of making bold moves.

Success is stumbling from failure to failure with no loss of enthusiasm.

I have tried 99 times and have failed, but on the 100th time came success.

You become strong by defying defeat and by turning loss and failure into success.