I do not believe it is in our nature to love impartially. We deceive ourselves when we think we can love two beings, even our own children, equally. There is always a dominant affection.
As to moral courage, I have very rarely met with the two o'clock in the morning kind. I mean unprepared courage, that which is necessary on an unexpected occasion, and which, in spite of the most unforeseen events, leaves full freedom of judgement and decision.