time heals all wounds; time is the best medicine
Proverbial expression meaning that emotional pain or difficulties will fade with the passage of time. Often used to comfort someone.
Even the pain of a broken heart will gradually ease with time.
It's hard now, but time heals, so don't rush.
Compound of 日にち (days, time) and 薬 (medicine). The idea that the passage of days acts as a healing medicine is a common metaphor.