Proverbs 2:6-11
For the LORD gives wisdom;
from his mouth come knowledge and understanding;
he stores up sound wisdom for the upright;
he is a shield to those who walk in integrity,
guarding the paths of justice
and watching over the way of his saints.
Then you will understand righteousness and justice
and equity, every good path;
for wisdom will come into your heart,
and knowledge will be pleasant to your soul;
discretion will watch over you,
understanding will guard you

Taken from the Desiring God Blog

The radical claim of the Bible is that wisdom isn't first a book, or a system, or a set of commands or principles. No, wisdom is a person, and his name is Jesus Christ. When you and I are graced into acceptance with him, we're drawn into a personal relationship with Wisdom, and Wisdom begins a lifelong process of freeing us from the stronghold that the foolishness of sin has on us. We aren't yet completely free, but there will be a day when our every thought, desire, choice, action, and word will be fundamentally wise!

It makes such sense then, that a repentant man (David) would reflect on his need for wisdom. Sin, in reducing us to fools, causes us to do foolish things, even though we think we're wise. And for this we need more than information, education, and experience. We need exactly what we find in Christ—grace.

Wisdom is the product of grace; there is simply nowhere else it can be found.