Here is the Lord’s own teaching on the maintaining of Christian joy, including reflection on conversion blessings, rewards in striving for holiness, seeing the risen Christ near at hand by faith, a life of answered prayer, the practice of anticipation, and the right handling of trials.
Spiritual joy is a deep cheerfulness and gladness of heart. It is happiness and a calm spirit. It comes to us as the direct result of knowing Christ Jesus, along with all that he has done for us, and will do, not just in this life, but eternally. It has a constant property, flourishing in the worst soil, and coexisting with fierce conflict, disappointment and loss.