Today is the Memorial of St. Francis de Sales, Bishop and Doctor of the Church. First part of the Responsorial Psalm (#40) reads:
Sacrifice or oblation you wished not,
but ears open to your obedience you gave me.
Burnt offerings or sin-offerings you sought not;
then said I, "Behold, I come."
The Response reads: Here am I, Lord; I come to do your will.
I do see that to do the Lord's will does not mean that I do not ask for anything for myself anymore. He may even want me to sacrifice in a certain way or offer him certain things. Doing his will simply covers (governs) how I am going to live, pray, and serve him. In short, doing the Lord's will is to do only what he tells me to do, and that could be anything.