Who hath ascended up into heaven... — The reason of Agur’s sadness is here declared. He feels himself far off from possessing anything that may be called knowledge of God or of His works. (Comp. Galatians 4:9; 1 Corinthians 13:12.) The questions in this verse are intended to bring out the nothingness of man as compared with the might of the Creator of the Universe; they resemble Job 38-41, and Isaiah 40:12 sqq.
Who hath bound the waters in a garment? — Stretching out the clouds as a “curtain” (Psalms 104:2; Isaiah 40:22), to keep the rain from falling upon the earth. (Comp. Job 26:8.)
What is his name? — We may call Him the Self-existing (Jehovah), Powerful (Shaddai), Strong (El). Awful (Eloah) Being; we may describe Him as merciful, gracious, etc. (Exodus 34:5 sqq.), but no words will describe Him adequately, for not till the next life shall we see Him as He is (1 John 3:2), and He has been pleased to reveal Himself only partially to us.
What is his son’s name? — See the description of wisdom in Proverbs 8:22 sqq., and the notes there.