First, start learning to move from the known toward the unknown, and your life will become a great excitement, a great joy, a great surprise. Every moment something new is happening. And then one day take the ultimate risk: move from the unknown to the unknowable. The difference is that the unknown will become known, and the unknowable will never become known.
That unknowable is existence.
But first learn to move from the known to the unknown. That is learning to swim in shallow water. And when you have learned to swim, go into the ocean with no fear, with absolute fearlessness and then your life will know what ecstasy is. With the unknown, you will know excitement: with the unknowable, you will come to know ecstasy.