The difference between a person that fails and a person that is a failure is the person that fails prepares better and comes back harder.
A key to enjoying life is being content in knowing that the number of your successes exceeds the number of your failures by one.
Wisdom grows from understanding, not knowledge. A person with a little knowledge and a lot of wisdom will typically succeed whereas the person filled with knowledge untempered by wisdom will typically fail.
If we fail to study where we have failed in the past, we will succeed in failing in the future.