“Nothing ever does happen in the future and nothing ever has happened in the past; the only happening is in the present moment. And yet people everywhere are so wrapped up in the past and future that the present moment tends to be overlooked. Yet this present moment is the only moment of reality; everything else is imagination. Now is the only time we can live. We can't live in the past, although some attempt it, and we can't live in the future. We live now or not at all.”
On Eagle's Wings, 1977, p. 159
As of a Trumpet, On Eagle's Wings
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Martin Cecil, 7th Marquess of Exeter 12
Marquess of Exeter 1909–1988Related quotes

“There is no present or future-only the past, happening over and over again-now.”
Source: A Moon for the Misbegotten

Variant: Life can be found only in the present moment. The past is gone, the future is not yet here, and if we do not go back to ourselves in the present moment, we cannot be in touch with life.

Understanding Our Mind (2006) Parallax Press ISBN 978-81-7223-796-7
Words of Wisdom from Buddhist Master Jun Hong Lu, Volume 1 (2016) ISBN 978-0-6482300-1-4

Attributed without citation at Nonduality Salon Highlights, #1891 http://www.nonduality.com/hl1891.htm, 15 August 2004

Sam Harris, "Death and the Present Moment", speech at the Global Atheist Convention (April 2012) http://www.youtube.com/watch?v=ITTxTCz4Ums&t=21m21s
2010s