It was ever thus informal
A humorous way of of saying things are always this way or something has always been this way
Twas ever thus, on the first page of our life's story, everything seems so bright.
Everyone gets married and has babies when they grow up. It was ever thus.
To not react or deal with something that is wrong or unpleasant
Unchanged, be stable.
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.