Phillipians 4:6 describes the divine cure for all fear, worry and anxiety. All these things are closely related to doubt and unbelief.. ..The Scripture verse is also the divine prescription for securing the peace that surpasses all understanding and keeps the heart and mind in quietness and peace. We need to guard against unbelief as we would against an enemy. Faith needs to be cultivated. Faith is increased by exercise; by being put to use. It is nourished by trials. Faith grows by reading and meditating on the Word of God. Most of all,faith thrives in an atmosphere of prayer.