It is difficult to retain what you may have learned unless you should practice it. -Difficile est tenere quae acceperis nisi exerceas
Pliny the YoungerLet us strive the more earnestly therefore to lengthen out our span of life-- life that is poured out like water and falls as the leaf-- if not by action (the means to which lie in another's power), yet in any case by study and research; and since it is not granted us to live long, let us transmit to posterity some memorial that we have at least lived.
Pliny the Younger