The Mahabharata - pg. 205

But, Arjuna was no ordinary man but a great soul and a true hero who felt that his duty as a strong, brave man was to help others to rise above their weakness. Knowing that nature had endowed him with courage and bravery at birth, and that he owed them to no special exertions on his part, he had the true humility of the really great and he did what he could to put courage into Uttara and make him worthy of his lineage.
This was Arjuna's characteristic nobility. He never abused his strength and power. One of his many names Bibhatsu, which means one who shrank from doing an unworthy act, and he lived up to it.