Sacrifice is not measured by how much you give, but by how much you have left over.
This one came to me a little while back. It is based in the story of the Widow's offering. Here is that story, found in Mark 12:41-44:
And he sat down opposite the treasury and watched the people putting money into the offering box. Many rich people put in large sums. And a poor widow came and put in two small copper coins, which make a penny. And he called his disciples to him and said to them, "Truly, I say to you, this poor widow has put in more than all those who are contributing to the offering box. For they all contributed out of their abundance, but she out of her poverty has put in everything she had, all she had to live on.
I don't have the time, or the energy, to develop this thought. It is just something that has been on my mind lately.