Joy (n.) in doing God's will can be so great that a saint would run to hell for it.
Joy (n.) in God is Habakkuk's last answer: let the fig tree fail and the fields go bare, he will still rejoice.
Joy (n.) at its deepest rests on the certainty that there is meaning on the far side of mystery.
Joy (n.) can burn up the power of evil; not every joy leads to God, but every joy comes from him.
Joy (n.) is not pleasure; the commandments were not given for pleasure, yet they were given for joy.
Joy (n.) is not spoiled by sacrifice or suffering; they are part of the recipe.
Joy (n.) comes from giving and serving, never from getting and taking.