Assuming you mean Bible verses (and perhaps passages), off the top of my head, I think of Romans 1:20:
For the invisible things of him, from the creation of the world, are clearly seen, being understood by the things that are made; his eternal power also, and divinity: so that they are inexcusable.
The point of this passage is not exactly to extol human reason, but it implies that we are capable of knowing of God's existence and our duty towards him, from natural reason alone (i.e. by extrapolating from creation). This speaks to the power of reason, at least.