Since ancient times, deep love cannot be retained, only routines can win people's hearts.
The meaning of this sentence is: Since ancient times, people who use sincerity and true feelings are often not valued, but are not as popular as those who do things in a set way (smooth and scheming).
This sentence expresses the feeling that people who give sincerely are not as good as others who play tricks and are appreciated.
Extended information:
This poem comes from Tong Yao's "Ace Censor"
Everyother's oath is useless, it has to be filled with gold and silver.
Since ancient times, deep feelings cannot be retained, and they always use tricks to win people's hearts.