Akademik

Природа свое возьмет
You cannot change the nature of people. See Горбатого могила исправит (Г)
Cf: Nature will take its course (Br.). What is bred in the bone will not /come/ out of the flesh (Am., Br.). What's in the bone is in the marrow (Am.)

Русско-английский словарь пословиц и поговорок. . 2013.