The greatest obstacle to joy is a fully paid-up joylessness.
You can look ahead to happiness, or you can look back on it, but it's so hard to notice it to your left or right.
We fancy that we would be happier in some far away place, as if you could catch a plane to a state of mind.
The key to happiness is pretty much the same as the key to worry and anxiety -- you must learn to make a big deal out of nothing.