“In any weather, at any hour of the day or night, I have been anxious to improve the nick of time, and notch it on my stick too; to stand on the meeting of two eternities, the past and future, which is precisely the present moment; to toe that line.”
Source: Walden
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Henry David Thoreau 385
1817-1862 American poet, essayist, naturalist, and abolitio… 1817–1862Related quotes

"Heroic Reason", as translated by H. R. Hays, in Selected Writings of Juan Ramon Jimenez (1957) edited by Eugenio Florit, p. 231.
Context: A permanent state of transition is man's most noble condition. When we say an artist is in a state of transition, many believe that we are belittling. In my opinion when people speak of an art of transition this indicates a better art and the best that art can give. Transition is a complete present which unites the past and the future in a momentary progressive ecstasy, a progressive eternity, a true eternity of eternities, eternal moments. Progressive ecstasy is above all dynamic; movement is what sustains life and true death is nothing but lack of movement, be the corpse upright or supine. Without movement life is annihilated, within and without, for lack of dynamic cohesion. But the dynamism should be principally of the spirit, of the idea, it should be a moral dynamic ecstasy, dynamic in relation to progress, ecstatic in relation to permanence.

“I now spend a good part of my day dreaming of times past, present and future.”
90th Birthday Reflections (2007)
Context: I now spend a good part of my day dreaming of times past, present and future. As I try to survive on 15 hours sleep a day, I have plenty of time to enjoy vivid dreams. Being completely wheel-chaired doesn't stop my mind from roaming the universe — on the contrary!

2000s and posthumous publications, 90th Birthday Reflections (2007)
“There was no future and no past. The present was eternity.”
Statement about perceptions he experienced in early clinical experiments with LSD. How Do We Know Who We Are? : A Biography of the Self (1997)

“The past has ended its time, the present is the moment, the future the becoming.”
Original: (it) Il passato ha concluso il suo tempo, il presente è l'attimo, il futuro il divenire.
Source: prevale.net

Time in History: Views of Time from Prehistory to the Present Day (1988), p. 21