It is a poor heart that never rejoices
It is a poor heart that never rejoices.and It is a sad heart that never rejoices.
Prov. Even a habitually sad person cannot be sad all the time. (Sometimes used to indicate that a habitually sad person is happy about something.) Jill: I've never seen Sam smile before, but today, at his retirement party, he smiled. Jane: It is a poor heart that never rejoices.