There is persistence and then there is pig headedness. Knowing the difference is the challenge. I love these two quotes from Winston Churchill

“Never Give In”

The speech was made 29 October 1941 to the boys at Churchill’s old public [private] school, Harrow–not Oxford or Cambridge:

“Never give in–never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honour and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy.”

?Success is the ability to go from failure to failure without losing your enthusiasm.?