I like Judge Learned Hand, but I think this particular quote is just Deep Wisdom. Living in a pleasant society requires both good laws and good people. There is very little substantive content in LH's oratory. He could just as easily have made the opposite point:

What does it mean to strive for fairness or impartiality? I often wonder whether we do not rest our hopes too much upon virtue, upon self-discipline, and upon honor. These are false hopes; believe me, these are false hopes. Justice is simply a matter of fair play; when the rules are made to be broken, no amount of personal virtue can keep a man from temptation, and when the rules are honestly followed by one's peers, no special virtue is needed to join them.