Trust is very closely tied to expectations. As we get to know people, we develop expectations of them. Expectations are not just things we make up, they are based on experience and have logical reasoning behind them. Although expectations are often associated with circumstances, the main reason we think certain things will happen is because someone has caused them to happen and expectations help us to prepare for what that person is going to do.
The primary person we develop expectations of is God. Even people that do not believe in God still have a concept of God and therefore, have some expectation of what he will do. I think most people that do not believe in God believe he punishes people for doing bad things, and because everyone does bad things, they expect him to punish them. The choose not to believe in him to avoid punishment.
On the other hand, I think most people that say they trust God believe he rewards people for doing good things. They choose to trust him because they expect to get a reward someday. I don’t think it is possible to trust anyone unless you have some positive expectation of him or her.
David said in Psalm 56:3-4, “What time I am afraid, I will trust in thee, in God I will I praise his word, in God have I put my trust: I will not fear what flesh can do unto me.” David knew from experience that when he was in a scary situation, God was with him. David developed an expectation of being delivered from dangerous situations because he had been delivered from dangerous situations in the past. Over time, David began to trust that God would always be with him and would deliver him from every danger that threatened his life.
The reason David recorded his personal experiences with God is because he knew that what was true for him was true for every Believer. God did not take care of David any differently after he was anointed to be king than when he was a shepherd tending his father’s flock. David learned that if he needed help, all he had to do was call out to God and he would take care of it.
When I cry unto thee, then shall my enemies turn back: this I know; for God is for me. (Psalm 56:9)