You have to be strong.

You have to be strong, You have stand up for the truth. / Ты должен быть сильным. Ты должен подняться и отстоять правду.

You have to think about the things you say.

You have to go with what your heart tells you.

You have to trust me.

I'll show you what's going on, but you have to trust me. / Я покажу тебе, что происходит, но ты должен мне доверять.

You have to totally trust me.