In my mind's eye I visualize how a particular... sight and feeling will appear on a print. If it excites me there is a good chance it will make a good photograph. It is an intuitive sense an ability that comes from a lot of practice.
The greatest loss of time is delay and expectation, which depend upon the future. We let go the present, which we have in our power, and look forward to that which depends upon chance, and so relinquish a certainty for an uncertainty.