Jesus said to them, “I am the bread of life; he who comes to me shall not hunger, and he who believes in me shall never thirst.” (John 6:35)
What you need to see here is that the essence of faith is being satisfied with all that God is for you in Christ.
This statement emphasizes two things. One is the “God-centeredness” of faith. It is not merely the promises of God that satisfy you. It is all that God himself is for you. Faith embraces God — not just his promised gifts — as your treasure.
Faith banks its hope not just on the real estate of the age to come, but on the fact that God will be there for you (Revelation 21:3). And even now what your faith embraces most earnestly is not just the reality of sins forgiven (as precious as that is) but the presence of the living Christ in your heart and the fullness of God himself (Ephesians 3:17–19).
The other thing emphasized in defining faith as being satisfied with all that God is for you is the term “satisfaction.” Faith is the quenching of the soul’s thirst at the fountain of God. In John 6:35 we see that “believing” means “coming” to Jesus to eat and drink the “bread of life” and the “living water” (John 4:10, 14) which are nothing other than Jesus himself.
Here is the secret of the power of faith to break the enslaving force of sinful attractions. If your heart is satisfied with all that God is for you in Jesus, the power of sin to lure you away from the wisdom of Christ is broken.