They stir us to appropriate activity to relieve the need or solve the problem. They move us to treat our cancer, search for the missing child, work to evangelize the lost, and to pray and to depend upon God. He was spurred to do greater things then. Fear, rightly directed, is the father of courage. It stimulates the adrenaline and brings out the best in us.
Some anxieties hinder.
Anxieties must be acted upon or they can become paralyzing. Jesus would have us to be free of anxieties, not because total mental discipline which overrides emotions is necessary for salvation, but so that we may enjoy a fuller, happier life as a disciple.