Because your own strength is unequal to the task, do not assume that it is beyond the powers of man; but if anything is within the powers and province of man, believe that it is within your own compass also.
Mohammed was not an apparent failure. He was a dazzling success, politically as well as spiritually, and Islam went from strength to strength to strength.
I do think the heart can balance out the mind, if your heart is in a good place it can give you the strength to do the right thing and behave the right way and overcome the mind.