Reference wanted for "To see your past karma, look at your present body (and environment)...." This is a reference request, not a doctrine question. I recall seeing a quote from a Buddhist text or teacher roughly to this effect...


To see your past karma, look at your present body (and
environment). 
To see your future lives, look at your present mind.


The closest I can find now from a teacher or text is a quote from Philip Kapleau's Three Pillars of Zen...


  Thus our present life and circumstances are the products of our past
  thoughts and actions, and in the same way our deeds in this life will
  fashion our future mode of existence.” (p. 408)


... which is close -- "life and circumstances" vs "body and environment" and "deeds" vs "mind"-- but not quite. If anybody can supply a pointer to the body/environment/mind version, I'd be grateful.
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.