Time isn't a commodity, something you pass around like a cake. Time is the substance of life. When anyone asks you to give your time, they're really asking for a chunk of your life.
Today is the starting line for the rest of your life. Yes, today is the tomorrow you worried about yesterday. The problem with the past is that we remember memories we shouldn't, and we don't forget what we should. If your eyes are stuck in the rearview mirror, you're stuck in the past. If you're stuck in the past, you're not looking ahead. If you're not looking ahead, you can't hit the mark of your future
Time is the coin of your life. It is the only coin you have, and only you can determine how it will be spent. Be careful, lest you let other people spend it for you