Trusting the goodness of God is one of the great challenges in life. In scripture Peter felt fear and faltered.
Much focus on faltering in preaching is on Peter, but all the disciples faltered to a degree. Often we try to place ourselves higher than the apostles.
They had doubts and faltered at times. Trusting God is hard because life is hard.
Trusting God is an element of faith that is not normal for fallen people. God is on our side.
Being honest about our shortcomings allows us to grow. If we struggle at times to trust God we can take comfort that God knows our nature.
God calls those with doubts and struggles into the fellowship and comfort of eternal fellowship with himself.