Galatians 6:9-10 ESV
"And let us not grow weary of doing good, for in due season we will reap, if we do not give up. So then, as we have opportunity, let us do good to everyone, and especially to those who are of the household of faith."
See it at YouVersion.com:
http://bible.com/59/gal.6.9.esv
Many times I am guilty of this. That is, growing weary of being kind. I sometimes wonder if I don't let out a little bit the old ass of a self then I fear I might implode completely. But then after a little steam is released (and perhaps a little guilt too) I begin to look at what doing good things does for making my day a little better. And I am reminded by what Ben Franklin said in that you do well by doing good. And so I push myself to embrace the steam building up in me and used the energy to do something good. And do it well.