'Searching' in the Bible

Canst thou by searching find out God? Canst thou find out the Almighty unto perfection?

The spirit of man is the lamp of Jehovah, Searching all his innermost parts.

Hast thou not known? hast thou not heard? The everlasting God, Jehovah, the Creator of the ends of the earth, fainteth not, neither is weary; there is no searching of his understanding.