Where there is a will, there is a way.

We usually say "WHERE there's a will, there's a way" like klfaly stated. Sherry's answer is also good, a good translation from the original text...however, it would be best to switch the order and a few of the terms: If one put's their mind to it, there is nothing they cannot do. PS: sherry, if you say "one", you shouldn't follow with "his" or "her"

There is nothing unachievable in the world if one gives his mind on it.

If there's a will, there's a way.