Living well is the best revenge.

George Herbert (1593-1633) Welsh priest, orator, poet.

Jacula Prudentum, or Outlandish Proverbs, Sentences, &c. (compiler), # 524 (1640 ed.)
    (Source)

Perhaps a variant of John Lyly (1579): "The greatest harm that you can do unto the envious, is to do well."