Johnny Manziel knows a thing or two about failure in the NFL. The former first round pick's spectacular fall from grace, in full public view, has clearly helped change his life for the better though. 

After being released by the Browns in 2015 for a flurry of off field issues, Manziel has spent much of the past two years partying and doing anything but playing football. 

However, he is now fully committed to recapturing his place amongst the football elite. 'Comeback SZN' as he calls it, is in full swing, and Manziel seems to have his life back on track. He is set to appear in the Spring League starting this weekend; an organised league in Texas with the aim of showcasing talent to professional teams. 

After being diagnosed with bipolar disorder, the former Heisman Trophy winner has taken steps to correct his erratic behaviour and he wants others to learn from his mistakes. 

The enigmatic quarterback admitted that the disorder, as well as alcohol and his sense of entitlement nearly ruined him and left him at rock bottom with family members in despair at his refusal to seek help for such a long time. 

Manziel has been the popular comparison for many when referring to the possible downside of one the 2018 draft class's most polarising quarterback prospects Baker Mayfield.

And, the former Texas A&M star has now come out with some savvy advice to help the reigning Heisman winner avoid some of the issues he faced in the pro's.

When asked after throwing at Texas A&M's pro day earlier this week what guidance he would offer the projected first round pick, Manziel said: 

"Quiet the noise. The more you can do to stay quiet, the better. He's already a lightning rod, just like I was."

He continued: "If I could go back and change things, I would be the biggest homebody, the biggest football-only guy and not do much of anything else off the field because everything else already comes with huge publicity and huge talk.

"He doesn't have to do anything. If he can do that for a couple of years, then the whole narrative around him completely shifts from a guy who is outspoken and wild and cocky to a guy who's about his business and a guy who cares about his craft and what he's doing."

Mayfield has consistently rejected comparisons between the pair in the build up to the draft though. 

"Everyone wants to portray (me) as a bad boy, the Johnny Manziel stuff," Mayfield said at the Senior Bowl back in January. "I love the game of football, there's no doubt about that. I'm an emotional player. I'll do anything it takes to win. I love being around my teammates, leading and having responsibilities. It is what it is. If I paid too much attention to it, I'd be focusing on the wrong things."

Manziel is aware of the former Sooner's displeasure at being compared to him, but sees a lot of similarities between them on the field at least:

"I don't think he likes the comparisons to me, but at the end of the day we played similarly," Manziel said.

"We both aren't traditional, we both scramble, we both are from high schools in the hill country, we both played in similar schools in the same region of the country. Whether he likes it or not, there's a lot to compare."

Mayfield may not be a fan of being compared to Manziel as a pro, but he should heed his advice. Off field concerns are real surrounding the Oklahoma QB, and there's nobody better to talk straight to him about the potential pitfalls that await as a professional athlete than Manziel.