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If you want to know your past life, look into your present condition; if you want to know your future life, look at your present actions.-Guru Rinpoche 747 AD
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“If you want to understand the causes that existed in the past, look at the results as they are manifested in the present. And if you want to understand what results will be manifested in the future, look at the causes that exist in the present” (“The Opening of the Eyes,” The Writings of Nichiren Daishonin, vol. 1, p. 279).
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Found it... mostly -- Tweet by H.H. The Dalai Lama, May 6, 2010...
If you wonder what you were doing in the past, look at your body; to know what will happen to you in the future, look at your mind.
3149 retweets -- so that's probably where I saw it. As for adding environment to body, that's probably my interpolation, since the material circumstances of one's present life are clearly karmic, according to Buddhadharma.
It's probably impossible to trace this to a single origin, however, as it seems to be all over the place in various versions, including from sources other than Buddhists.