And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God. Romans 12:2
The Girl Talk Blog has a great article on preaching the gospel to yourself, taken from C.J. Mahaney's Living The Cross Centered Life.
How to Preach the Gospel to Yourself
I plan on posting this list on the wall in my room!