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“Mathematics, such as appertain to painting, are necessary to the painter, also the absence of companions who are alien to his studies: his brain must be versatile and susceptible to the variety of objects which it encounters, and free from distracting cares.”
― Leonardo da Vinci, Thoughts on Art and Life

“Soon earth will cover us all. Then in time earth, too, will change; later, what issues from this change will itself in turn incessantly change, and so again will all that then takes its place, even unto the world's end. to let the mind dwell on these swiftly rolling billows of change and transformation is to know a contempt for all things mortal.”
― Marcus Aurelius, Meditations

“And we who loved the world must learn the language of absence: days foreshortened, empty rooms, the irrevocable distance between the goodbye and the letting go.”
― Joe Bolton, The Last Nostalgia: Poems 1982-1990

“You can’t use your mind to understand your own mind.”
― L.A. Golding, Lerkus: A Journey to End All Suffering