Before his passing, Furuya Sensei would often say, "There is no time left." By the time I understood his admonishment, he was gone. So much time has passed since those times.
Upon realizing his words, the questions arise, "what will we do with our lives?" and "How will we live them?"
If there is truly no time left then life itself as we know is fleeting - It is passing us by as we speak. Understating this reality in Buddhism is called mujo or impermanence.
To understand budo is to understand death. Death, not in its morbidness, but in its impermanence and this inevitability teaches us how to live our lives. The glass can be either half full or half empty.
To see the fleetingness of life as something bad then we are looking at the glass as half empty. To see the glass as half full, we are realizing how in which to live our lives with what little precious time we have left.
Time does fly like an arrow, but we get to choose how and what we aim it at. What do you want to do? Who do you want to be? Time truly does fly by. Spend your days well for tomorrow may never come.