Reap What One Sows Meaning

(idiomatic) To receive as a reward or harvest in the same measure as one's exertions, in a good or a bad sense. To receive justice.

Example:   For whatever a man is sowing, this he will also reap.
2005, Tuesday November 15, PM Tony Blair, The Guardian
  "We will reap what we sow; live with what we do not act to change," he said.