Looking for location of a quote, "Nothing can work damage to me except myself", attributed to Ralph Waldo Emerson

Question

In what piece of work by Ralph Waldo Emerson can one find the following quote?

Nothing can work damage to me except myself; the damage that I sustain I carry about with me and never am a real sufferer except by my own fault.

Answer 1

In Emerson's Essays: First Series (1841), he wrote this phrase but attributed it to Saint Bernard (not the dog):

The gain is apparent; the tax is certain. But there is no tax on the knowledge that the compensation exists and that it is not desirable to dig up treasure. Herein I rejoice with a serene eternal peace. I contract the boundaries of possible mischief. I learn the wisdom of St. Bernard,--"Nothing can work me damage except myself; the harm that I sustain I carry about with me, and never am a real sufferer but by my own fault."

_{-- Emerson (source)}

I wasn't able to find out where St. Bernard said this. It's not in his collected letters, but it has been attributed to him by others as well as Emerson.