The Latin equivalent of the English sentence 'It is ever thus' is the following: Sic semper. The word-by-word translation is as follows: 'sic' means 'in this way, so, or thus'; and 'semper' means...
In the movie Carpe Diem Robin Williams says, "A man must dream or no man can he be, 'twas ever thus and ever thus shall be."
"Sic semper tyrannis!" ("Thus always to tyrants") was what John Wilkes Booth said before shooting Abraham Lincoln.
For (four) ever
Ad infinitum