Unmet expectations

This is from the daily e-mail I get "Prime Time with God".
When we react to circumstances with bitterness and resentment as a result of unmet expectations, we are saying that we know better than God, and that God has made a mistake in not meeting our expectations. The process of resolving unmet expectations may require full disclosure to the individual who was the source of the unmet expectation, and of how the unmet expectation made you feel. This is not to make the person feel obligated to meet the expectation, but simply to share your feelings about it. If God was the source, then it is important to share this with the Lord. However, once we have done this we must let go of the situation and allow God to work in our hearts the grace that is needed to walk in freedom from the pain of the unmet expectation. If we do not do this, we will allow the seed of bitterness and resentment to enter in. This seed of bitterness will create leanness in our soul and eventually will spread to others.