From my recent paper (“St. Paul on Jesus Christ, ‘Our Great God and Savior'”):
St. Paul teaches us that Christ is God is by predicating of Him other attributes proper to God (Prat). God knows everything: “before Him no creature is hidden, but all are naked and are laid bare to the eyes of the One to Whom we must render an account”(Hebrews 4:13). Creatures cannot know everything that God knows: “No one comprehends what is truly God’s except the Spirit of God,” says St. Paul (1 Corinthians 2:11; qtd. in ST I, q. 14, art. 2). Yet he tells us that “all the treasures of wisdom and knowledge” are hidden in Christ (Colossians 2:3). What else can this mean but that Christ knows all things and is therefore God?