That He may better prove His love for us...

For the eyes of the Lord are upon the righteous, and his ears towards their prayers...
~Psalm 34:15

This is a verse both comforting and terrifying. The fact that God's eyes and ears are attuned to me can be disconcerting when I desire to hide away my sins in secret. But when I remember that He looks on me with the love of a Father, and with abundant grace, I am truly comforted. And I feel God's call to me for fellowship with Him. As Calvin says, speaking of this verse:

This sentence so commends the providence of God--intent of his own accord upon caring for the salvation of the godly--as yet not to omit the exercise of faith, by which men's minds are cleansed of indolence. the eyes of God are therefor watchful to assist the blind in their necessity, but he is willing in turn to hear our groanings that he may better prove his love toward us...
Jean Calvin, The Institutes of the Christian Religion, Book III, Chapter 20, Part 3

And as to the desire to hide that sin from God, Jean addresses that as well:

Words fail to explain how necessary prayer is, and in how may ways the exercise of prayer is profitable. Surely with good reason the Heavenly Father affirms that the only stronghold of safety is calling upon his name. By so doing we invoke the presence both of his providence, through which he watches over and guards our affairs, and of his power, through which he sustains us, weak as we are and well-nigh overcome, and of his goodness, through which he receives us, miserably burdened with sins, unto grace: and, in short, it is by prayer that we call him to reveal himself as wholly present to us. hence comes an extraordinary peace and repose to our consciences. For having disclosed to the Lord the necessity that was pressing upon us, we even rest fully in the thought that none of our ills is hid from him who, we are convinced, has both the will and the power to take the best care of us.
~Jean Calvin, The institutes of the Christian Religion, Book III, Chapter 20, Part 2.