A Course in Miracles Topic - Joy

  Joy is the experience of Truth.

 The light that belongs to you is the light of joy. Radiance is not associated with sorrow. Joy calls forth an integrated willingness to share it, and promotes the mind's natural impulse to respond as one.    T-5.in.1:4-6.

You do not know your joy because you do not know your own Self-fullness. Exclude any part of the Kingdom from yourself and you are not whole. A split mind cannot perceive its fullness, and needs the miracle of its wholeness to dawn upon it and heal it.     T-7.IX.4:2-4.

Truth is the opposite of illusions because it offers joy. What else but joy could be the opposite of misery?... The search for joy in misery is senseless, ...All that is possible in the dark world of misery is to select some aspects out of it, see them as different, and define the difference as joy.
    Joy is eternal. You can be sure indeed that any seeming happiness that does not last is really fear. Joy does not turn to sorrow, for the eternal cannot change.  T-22.II.2:1,5,6/3:4-6.

[from a question in A Manual for Teachers: HOW SHOULD A TEACHER OF GOD SPEND HIS DAY.]There is one thought in particular that should be remembered throughout the day. It is a thought of pure joy; a thought of peace, a thought of limitless release, limitless because all things are freed within it. M-16.6:1,2.