I Feel You Lyrics

Lyric discussion by Karky 

Cover art for I Feel You lyrics by Sam Roberts

I think Sam looks upon Leonard as an idol. He was a famous singer-songwriter, musican, poet, and novelist. I also found this excerpt from Wikipedia that might explain the reference that you were inquiring about :

2005 bankruptcy

"On 8 October 2005, Cohen alleged that his longtime former manager, Kelley Lynch, misappropriated over US $5 million from Cohen's retirement fund leaving only $150,000.[36] Cohen was sued in turn by other former business associates.[36] These events placed him in the public spotlight, including a cover feature on him with the headline "Devastated!" in Canada's Maclean's magazine.[37] In March 2006, Cohen won the civil suit and was awarded US $9 million by a Los Angeles County superior court. Lynch, however, ignored the suit and did not respond to a subpoena issued for her financial records.[38] As a result it has been widely reported that Cohen may never be able to collect the awarded amount.[39] In 2007, U.S. District Judge Lewis T. Babcock dismissed a claim by Cohen for more than US $4.5 million against Colorado investment firm Agile Group, and in 2008 he dismissed a defamation suit that Agile Group filed against Cohen.[40] Cohen has been under new management since April 2005."

The line, 'Beware of those who might steal from you', makes sense given the financial loss Leonard sustained at the hands of his former manager......5 million US dollars is a lot to have taken from you, even by today's standards.

thats why he says "my Achilles heel is showing" because hes saying to sam that hes showing vulnerabilities. Hes learning from Cohens mistakes.