As a well-spent day brings a happy sleep, so a well-employed life brings a happy death - Leonardo da Vinci

Of several luminous bodies of equal size and brilliancy and at an equal distance, that will look the largest which is surrounded by the darkest background.

...the love of anything is the offspring of knowledge, love being more fervent in proportion as knowledge is more certain. And this certainty springs from a complete knowledge of all parts which united compose the whole of the thing which out to be loved.

Impetus is a power of the mover applied in a movable thing which causes the movable thing to move after it is separated from its mover.