You feel happiness or joy ONLY when your inner mind, or subconscious, believes that it is making progress toward you survival. That is the ONLY cause of your feelings of joy. Those inner thoughts can easily be in error, but regardless, you can feel joy by no other means. Even chemicals must inspire that same sense from then in order to cause your feeling of joy.
What that means is that a sensing of progress toward survival is above the concern for joy in that such a sense must occur to cause the feeling. But more importantly, you cannot feel joy if you do not survive. You must exist to know happiness.
This means that existence or survival is actually even higher than feeling joy. But sensing your progress toward that survival is all that is needed to ensure the feeling of joy as you do what is needed to survive. You get the best of both worlds.
And THAT is the Gospel of the real Jesus, just put into techy terms.