You can become blind by seeing each day as a similar one. Each day is a different one, each day brings a miracle of its own. It's just a matter of paying attention to this miracle.
That is the simple secret of happiness. Whatever you are doing, don’t let past move your mind; don’t let future disturb you. Because the past is no more, and the future is not yet. To live in the memories, to live in the imagination, is to live in the non-existential. And when you are living in the non-existential, you are missing that which is existential. Naturally you will be miserable, because you will miss your whole life.
For the current of our spiritual life creeds, rituals and channels that may thwart or help, according to their fixity or openness. When a symbol or spiritual idea becomes rigidly elaborate in its construction, it supplants the idea which it should support.