Ephesians 1:17
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:
The Spirit of wisdom is one of the Seven Spirits of God. See Isaiah 11:2. The Scripture says ...may give unto you the spirit of wisdom and revelation in the knowledge of him...
This knowledge here is called "epignosis." It means o recognize, perceive, or become fully acquainted with.