mind you / mark you

[aristide]

Hi, as reading the following sentences please explain me " mind you" and "mark you"

1- But mark you,my friends, I will return with a vengeance
2- Mind you, no sugar please.

Thanks.

[Pete]

Hi, as reading the following sentences please explain me " mind you" and "mark you"

1- But mark you,my friends, I will return with a vengeance
2- Mind you, no sugar please.

Thanks.
Mark you -- be aware; note what I say.

Mind you -- Keep in mind; don't forget.