内心的强大才是真正的强大，英文怎么说？

Only when you have a strong spirit are you truly strong.

Strong from our heart is the real strong.

有可能会错哦，不过我已经尽力了,祝你成功!!!呵呵^_^

the real power lies in strong heart.

Those with inner strength are the ones with real strength

strong from inside is the real "strong"