O Almighty God, who alone canst order the unruly wills and affections of sinful men; Grant unto thy people, that they may love the thing which thou commandest, and desire that which thou dost promise; that so, among the sundry and manifold changes of the world, our hearts may surely there be fixed, where true joys are to be found; through Jesus Christ our Lord. Amen.John says that if we ask anything according to God's will, he hears us (I John 2:14). What could be more the will of God than our loving that which God commands and desiring what he promises? And it isn't as easy as it sounds, either.
Here is my older post on this very collect, in which I said it much better and also gave a bit of the history of the collect.
Also of possible interest: Long comment I wrote at W4 on ecumenism and forms of worship.