Happiness must be constant, because it is attained by giving up the wish for the inconstant. Joy cannot be perceived except through constant vision. And constant vision can be given only those who wish for constancy.*
If you are honest, constant happiness seems threatening. You would have no option to choose an ego thought. You could never change your mind and be unhappy again.
Just sit for a moment and image constant joy. You may get in touch with just how uncomfortable it is to be without the option to be unhappy. Being miserable still holds some attract to you because it seems to mean that you are in control.
For if what you desire you receive, and happiness is constant then you need ask for it but once to have it always. And if you do not have it always, being what it is, you did not ask for it.*
You think you want to be happy and then realise that true happiness is constant then it is helpful to be honest and admit you are not ready.
So when you say you want to be happy you are really saying:
“I want to be happy just now, but I reserve the right to get upset later. I reserve the option to get upset if someone lies, takes my money or my body gets ill. I want to see at times through the bodies eyes rather than the vision of happiness.”
The bad new is that God’s gift to you is constant happiness, not inconstant happiness. You do not have it because you don’t want to give up the option to change your mind again. Your defense is to be uncertain and not single minded in your desire for happiness. Uncertainly protects your from God’s gift of constant happiness.
God has already given all that he (you as the son of God) really wants. Yet what he is uncertain of, God cannot give. For he does not desire it while he remains uncertain, and God’s giving must be incomplete unless it is received.*
A least we can be clear what true happiness is and know that when we reserve the option to get upset, we are not ready for it. We think giving up our identification with the body and our experience of change is giving up something valuable. We get to choose when we are ready for constant happiness. Our true Identity waits for us without impatience because it is a state of constant happiness.
The constancy of happiness has no exceptions; no change of any kind.*
*All quotes in bold are from section VII and VIII at the end of Chapter 21 in the Text of A Course in Miracle.