Abraham was "fully assured" (Ro 4:21) of what God had promised. He attained "the full assurance of understanding, resulting in a true knowledge of God's mystery" (Col 2:2). How is knowledge received? Paul prayed for people asking "that you may be filled with the knowledge of His will in all spiritual wisdom and understanding" (Col 1:9). He prayed that God would "give you a spirit of wisdom and of revelation in the knowledge of Him" (Eph 1:17). It is received by the spirit. Paul prayed that "the eyes of your heart may be enlightened" (:18). God "gave us the Spirit in our hearts" (2Co 1:22). He asked for them "to be strengthened with power through His Spirit in the inner man, so that Christ may dwell in your hearts through faith" (Eph 3:16-17). When "increasing in the knowledge of God [you are] strengthened with all power" (Col 1:10). You learn "what is the surpassing greatness of His power toward us who believe" (Eph 1:19).
You "abound still more and more in real knowledge and in all discernment" (Php 1:9) "increasing in the knowledge of God" (Col 1:10). In Christ "are hidden all the treasures of wisdom and knowledge" (2:3). The result is that you "put on the new self who is being renewed to a true knowledge according to the image of the One who created him" (3:10). You begin "to know the love of Christ which surpasses knowledge . . . [and are] filled up to all the fullness of God" (Eph 3:19). You attain "the knowledge of the Son of God, to a mature man" (4:13). You endeavor to "know Him, and the power of His resurrection and the fellowship of His sufferings, being conformed to His death" (Php 3:10).