From a John Piper sermon April 6, 2008:
"This is the way I live my life every day. My feelings are not God. God is God. My feelings do not define truth. God's word defines truth. My feelings are echoes and responses to what my mind perceives. And sometimes - many times - my feelings are out of sync with the truth. When that happens - and it happens every day in some measure - I try not to bend the truth to justify my imperfect feelings, but rather, I plead with God: Purify my perceptions of His truth and transform my feelings so that they are in sync with the truth.
That's the way I live my life every day. I hope you are with me in that battle...
I hope you are learning with me how to avail yourself of the power of the Holy Spirit to put to death feelings that are out of sync with the truth, and how to lay hold on God for the transformation of your feelings so that they match the truth of God's word."