This is my truth

Earth arise (earth)

Earthrise: a view of planet earth from the moon William Anders / NASA
Earthrise. It inspired, among other things, Earth Day; another celebration day to stir the imaginations of Hallmark's marketing boyz 'n' gurlz.

Maj. Gen. William Anders (retd), the Apollo 8 astronaut who captured the famous colour image of earth rising from the moon in 1968, has died at the age of 90 doing what he loved, crashingflying a plane.

Of his famous image, which is credited with energising the environmental movement, he later wrote:

We set out to explore the moon and instead discovered the Earth.

William Anders,, 50 Years After 'Earthrise,' a Christmas Eve Message from Its Photographer, Space.com (24.12.2018)

After all of the technical feats getting Apollo 8 to where it was, capturing that shot was plain and simple. And yet, at the same time, one of the most momentous, beautiful, stirring, and influential photographic images in history was born.

RIP sir.

Another, perhaps more inspirational, version of that quotation is also given in places:

We came all this way to explore the Moon, and the most important thing is that we discovered the Earth.

William Anders

But while attributed to Anders, I cannot find when or where he stated or wrote it. It was, however, once quoted as such in 2009 by US President Barack Obama, in a speech to the National Academy of Sciences. He, or rather his speech-writer, didn't list the citations used though.