“O the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments, and His ways past finding out! For who hath known the mind of the Lord? Or who hath been His counsellor? Or who hath first given to Him, and it shall be recompensed unto him again? For of Him, and through Him, and to Him, are all things: to whom be glory for ever. Amen.” Romans 11:33-36 (KJV)
Also see Job 41:11 and Isaiah 40:13.