nothing is difficult to a man who wills
All things are difficult before they are easy.
Confidence in yourself is the first step on the road to success.
Confidence of success is almost success.
Nothing in the world is difficult for one who sets his mind to it.
Nothing is difficult to the man who will try.
Nothing is impossible to a willing heart.
Where there is a will, there is a way.
Nothing is impossible (or difficult) to the man who will try.
Nothing is impossible to willing mind (or heart).