“Suppose we suddenly wake up and see that what we thought to be this and that, ain't this and that at all?”
Source: The Dharma Bums
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Jack Kerouac 266
American writer 1922–1969Related quotes

“We will all wake up semi-angels,
If we wake at all.”

“You clap. The Censor wakes up. We all get into trouble.”

"The Illusion of Rewards", p. 43
Awareness (1992)
Context: Do you know what eternal life is? You think it's everlasting life. But your own theologians will tell you that that is crazy, because everlasting is still within time. It is time perduring forever. Eternal means timeless — no time. The human mind cannot understand that. The human mind can understand time and can deny time. What is timeless is beyond our comprehension. Yet the mystics tell us that eternity is right now. How's that for good news? It is right now. People are so distressed when I tell them to forget their past. They're crazy! Just drop it! When you hear "Repent for your past," realize it's a great religious distraction from waking up. Wake up! That's what repent means. Not "weep for your sins.": Wake up! understand, stop all the crying. Understand! Wake up!

“We wake, if we ever wake at all, to mystery, rumors of death, beauty, violence…”
Source: Pilgrim at Tinker Creek

The statement "The future of all life, including our own, depends on our mindful steps." and much of the theme of this essay also occur later in his writings, including The World We Have : A Buddhist Approach to Peace and Ecology (2008), Ch. 1 : The Bells of Mindfulness, p. 3
The Sun My Heart (1996)
Context: All life is impermanent. We are all children of the Earth, and, at some time, she will take us back to herself again. We are continually arising from Mother Earth, being nurtured by her, and then returning to her. Like us, plants are born, live for a period of time, and then return to the Earth. When they decompose, they fertilize our gardens. Living vegetables and decomposing vegetables are part of the same reality. Without one, the other cannot be. After six months, compost becomes fresh vegetables again. Plants and the Earth rely on each other. Whether the Earth is fresh, beautiful, and green, or arid and parched depends on the plants.
It also depends on us. Our way of walking on the Earth has a great influence on animals and plants. We have killed so many animals and plants and destroyed their environments. Many are now extinct. In turn, our environment is now harming us. We are like sleepwalkers, not knowing what we are doing or where we are heading. Whether we can wake up or not depends on whether we can walk mindfully on our Mother Earth. The future of all life, including our own, depends on our mindful steps.

“We are what we think.
All that we are arises with our thoughts.
With our thoughts we make the world.”
As rendered by T. Byrom (1993), Shambhala Publications.
There is no quote from the Pali Canon that matches up with any of these. The closest quote to this is in the Majjhima Nikaya 19:
"Whatever a monk keeps pursuing with his thinking & pondering, that becomes the inclination of his awareness. If a monk keeps pursuing thinking imbued with sensuality, abandoning thinking imbued with renunciation, his mind is bent by that thinking imbued with sensuality. If a monk keeps pursuing thinking imbued with ill will, abandoning thinking imbued with non-ill will, his mind is bent by that thinking imbued with ill will. If a monk keeps pursuing thinking imbued with harmfulness, abandoning thinking imbued with harmlessness, his mind is bent by that thinking imbued with harmfulness." Sources: http://www.accesstoinsight.org/tipitaka/mn/mn.019.than.html
Misattributed

“Once we dreamt that we were strangers. We wake up to find that we were dear to each other.”

“If you wake up with his thoughts.. then it's really important.”
Original: (it) Se ti svegli con il suo pensiero.. allora è davvero importante.
Source: prevale.net