I began reading through the book of Psalms on Sunday. I memorized Psalm 1 when I was very little, and while I don't know that I could recite it perfectly anymore, it is a Psalm that has stuck with me many times. It's short (only six verses), but powerful. Take some time to read and meditate on it. :)
Blessed is the man who walks not in the counsel of the wicked, nor stands in the way of sinners, nor sits in the seat of scoffers;
but his delight is in the law of the Lord, and on his law he meditates day and night.
He is like a tree planted by streams of water that yields its fruit in its season, and its leaf does not wither. In all that he does, he prospers.
The wicked are not so, but are like chaff that the wind drives away.
Therefore the wicked will not stand in the judgment, nor siners in the congregation of the righteous;
for the Lord knows the way of the righteous, but the way of the wicked will perish.