“Most men stop …

“Most men stop when they begin to tire. Good men go until they think they are going to collapse. But the very best know the mind tires before the body and push themselves further and further, beyond all limits. Only when these limits are shattered can the unattainable be reached.”

Said by Dr. Mark Mysnk. 

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“…Knowing who…

“…Knowing who I actually am is the key to reach perfection… Because that means knowing what I can and cannot do.”
“That’s what a loser would say. Isn’t acknowledging what you can’t do the same as giving up?”
“No. It means… to forgive yourself for what you aren’t able to do.”

An exchange between Itachi and Kabuto during their fight. Definitely a good take on the moral of knowing your limits.