Which idioms have the words bitter and sweet?

The hard days have passed and the good days have come.

Sweet, sour, bitter and sweet refer to various tastes. Metaphor is happiness, pain, etc.

Sweet, sour, bitter and sweet refer to various tastes. It is often used to describe all kinds of encounters and complicated feelings in life.

Bitter before sweet means bitter before happy.

Recall past sufferings and today's happy life.

Sweet mouth and bitter heart, good intentions are not rewarded.