有志者事竟成

persevere and you will succeed (idiom); where there's a will, there's a way

lit. there is nothing the determined person can't accomplish (idiom); fig. persistence will overcome

Heaven will not disappoint the person who tries (idiom). If you try hard, you're bound to succeed eventually.

the old man moves mountains (idiom); fig. where there's a will, there's a way

effort will undoubtedly lead to success (idiom)

no difficulty is insurmountable if one is sincere (idiom)