YOU SAID:

you will never cross the ocean unless you have to courage to lose sight of the shore

INTO JAPANESE

海岸を見失う勇気がなければ、海を渡ることはありません

BACK INTO ENGLISH

If you don't have the courage to lose sight of the coast, you won't cross the sea

INTO JAPANESE

海岸を見失う勇気がなければ海を渡らない

BACK INTO ENGLISH

If you don't have the courage to lose sight of the coast, you won't cross the sea