Ephesians 1 17-18

That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of Him. That the eyes of your understanding being enlightened; that you may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints.

Paul knew that by gaining wisdom and revelation in our spirit, we gain knowledge of God.  We need this revelation so that we gain a deeper understanding of the word.  Sometimes we read the word and not understand the meaning it has for our lives.  The spirit of wisdom and revelation in the knowledge of Him is the key to make our life a success.