Here Jesus makes a strong contrast between doubting and believing. The two produce opposite results. When we believe that God exists and that He loves us and wants to meet our needs, then our belief brings trust into our heart.
On the other hand, doubt can be just as real as faith. The reverse of faith, doubt tells us that God does not exist or that He is unloving and uncaring about our needs. Doubt gives rise to fear, which brings torment, not peace. Doubt and fear cut us off from the flow of life and blessing, which God desires to send our way.
In contrast, faith is openness and receptivity toward God and all His benefits. Expectancy in faith opens our life to God and puts us in a position to receive salvation, joy, health, financial supply, and peace of mind, all the things that doubt wants to steal from us!
Believe and receive everything good your heart longs for, and more!