Dear Anons: Winston Churchill once famously exhorted an audience to “never give in”. There is another saying attributed to him about perseverance. Here are three versions:

1) Success is the ability to move from one failure to another without loss of enthusiasm.

2) Success is going from failure to failure without losing your enthusiasm.

3) Courage is going from failure to failure without losing enthusiasm.

I have been unable to find a speech or letter by Churchill containing this expression. Would you please examine this topic?