live up to one's principles

elveihez tartja magát, kitart az elvei mellett 
(to live or act in accordance with one's principles )

stick to one's principles

live up to something = valamivel összhangban él, cselekszik  
(to live or act in accordance with something

nehezebb példamondatok:
  • Principles do not give us algorithms for living. They identify broad requirements we must live up to, but they do not actually tell us what to do.
  • Christians have been urged to live up to the very core of Christian principles, to help address the problems of moral decadence that had engulfed the youth of today. (cikk)
  • Every one of us has a role to play in the evolution of our planet, and to achieve world peace each of us must live up to our responsibilities and obligations.