“We are what we are, because of the vibrations of thought which we pick up and register, through the stimuli of our daily environment.”

New Year's Address to the Nation (1990)
Context: The worst thing is that we live in a contaminated moral environment. We fell morally ill because we became used to saying something different from what we thought. We learned not to believe in anything, to ignore one another, to care only about ourselves. Concepts such as love, friendship, compassion, humility or forgiveness lost their depth and dimension, and for many of us they represented only psychological peculiarities, or they resembled gone-astray greetings from ancient times, a little ridiculous in the era of computers and spaceships.

Page 68.
The Road to Mecca (1954)

Against fracking in the Karoo, 3 May 2011
Speaking & Features

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

Earth Day address, Grand Rapids, Michigan (22 April 1970); published in Gerald R. Ford, Selected Speeches (1973) edited by Michael V. Doyle <!-- p. 84 -->
1970s
Context: We have come tardily to the tremendous task of cleaning up our environment. We should have moved with similar zeal at least a decade ago. But no purpose is served by post-mortems. With visionary zeal but the greatest realism, we must now address ourselves to the vast problems that confront us.

The Sun My Heart (1996)
Context: Our Earth, our green beautiful Earth is in danger, and all of us know it. Yet we act as if our daily lives have nothing to do with the situation of the world. If the Earth were your body, you would be able to feel many areas where she is suffering. Many people are aware of the world's suffering, and their hearts are filled with compassion. They know what needs to be done, and they engage in political, social, and environmental work to try to change things. But after a period of intense involvement, they become discouraged, because they lack the strength needed to sustain a life of action. Real strength is not in power, money, or weapons, but in deep, inner peace. If we change our daily lives—the way we think, speak, and act—we change the world. The best way to take care of the environment is to take care of the environmentalist.

33
The Sublime Object of Ideology (1989)

On 4 March 2018, at the launch of the EFF's election registration campaign, Standard Bank arena, Johannesburg. As quoted by Bonolo Selebano in DA is a typical bully – Malema https://www.pressreader.com/south-africa/the-new-age-free-state/20180305/281698320249805, The New Age (Free State) (5 March 2018)