This is a line from the book I am currently reading (The Ruby Key by Holly Lisle)... I think if more people thought with this logic, the world would be an amazingly better place:
Let me set the scene up for you first:
The girl has fetched a vial of potion for an old woman who has been caged and is near death. The old woman told her the vial will bring the near-dead back to life. The girl both has family who could use such a potion, and suspects the old woman might have betrayed her... but here is what she thinks:
But the elixir was not mine. If I took it and left, the old woman would die.
...the question was not what sort of person she was. It was what sort of person I was.
I could not know her heart. With difficulty and hard work, my mother had always told me, I might know my own.
Then she gives the elixir to the old woman.
I just kind of thought that was a beautiful way to look at things.