Isaiah 40:31— They who wait for the Lord shall renew their strength.
Just as often as you refresh your body with rest and recreation, so cheer up your soul. Let your soul have two or three walks each day up Mount Tabor, that is, in some retired place of meditation of prayer.
Stir up your soul to talk with Christ. Consider the promises and privileges you enjoy. Think of them, roll them under your tongue, chew on them until you feel their sweetness in your soul. View them together and individually. Sometimes contemplate one in particular, or another more deeply. Consider how wonderful that your debts are cancelled, and how wonderful that God's wrath is satisfied. Consider how happy and safe a condition you are in as a son of God, and how pleasant a state not to fear death and hell.
This is using your faith. You will find your soul saying 'It is good to be here.' It is good to daily be here and often. Unstirred coals do not glow or give heat. The beauty of faith is its use. Don't just have muscles, use them. Let man diligently and thoroughly improve his faith and the joy it will bring him will be great.