Seven Ways to Pray for Your Heart from the Desiring God blog:
Whatever it takes, Lord--
give me delight in You as the greatest treasure of my heart,
align the desires of my heart with Yours,
increase my awareness of my dependence on You in everything so that I will live continually by faith,
teach me to discern good from evil through the rigourous exercise of constant practise,
keep me desperate for You because I tend to wander when I stop feeling my need for You,
discipline me for my good so that I may share Your holiness and bear the peaceful fruit of righteousness,
increase my resolve to do Your will with all diligence.
Whatever it takes, Lord.