Our faith must be rooted and grounded in who God is. As a believer trusts in the perfect character and nature of God, he can appropriate the Scriptures in every situation and detail of life. He bases decisions on absolute authority of the Word of God, rather than on sight evaluation or the limited perception of the senses. As he learns to think with the content of the Bible, he begins to rely on God's sovereignty, integrity, immutability, mercy, goodness, patience, faithfulness, holiness, power, and in His infinite capacity, "For when we were yet without strength, in due time Christ died for the ungodly" (Romans 5:6).
This faith is necessary for proper thinking (1); the content of what we think makes our faith valid. When we hear the Word of God, we are released. We think about the fact that not one of His promises will ever fall to the ground (2).
"For all the promises of God in him, are yea, and in him Amen" (II Corinthians 1:20a). It is impossible for God to lie (3). Because of these promises the believer can think in the right attitude by trusting not in his own faith, but in God's faithfulness. Thus, we come "boldly to the throne of grace" (Hebrews 4:16)!