There's an old saying
Practice what you preach
Practice what you preach is a variation of Practice yourself what you preach. I think we are all familiar with the phrase. I suspect most of us understand the basic sentiment upon first read.
This phrase addresses hypocrisy. It originally spoke to those who demanded others be pious while themselves partaking in sinful activities. It certainly applies to anyone whose personal life is lived in a manner incongruent with the values and behaviors they publicly espouse.