"And Jesus sat over against the treasury, and beheld how the people cast money into the treasury: and many that were rich cast in much. And there came a certain poor widow, and she threw in two mites, which make a farthing. And He called unto Him His disciples, and saith unto them, Verily I say unto you, That this poor widow hath cast more in, than all they which have cast into the treasury: For all they did cast in of their abundance; but she of her want did cast in all that she had, even all her living."
~Mark 12:41-44, KJV
It's when we are in the financial struggles that we least want to tithe and give money to the Lord. When we are living high on the hog it's not difficult to throw a little bit His way. Once again you can see that the Lord cares about the meaning and what's in your heart more than the amount of something. You can do a good act in life but why you are doing it is important and how much it takes for you to perform that act is what's important to the Lord. When it's harder to give that's when the Lord wants you to give most then He can bestow even greater blessings upon you.