This is a common thread in many traditions of wisdom. The words change (surrender, accept, be with, open to, observe, witness, feel, welcome, embrace etc.) but the idea is the same: you have to feel difficult emotions fully in order to process them.

Dr. K's Healthy Gamer Twitch stream offered another descriptor I like - digest. Emotions can be digested if you allow yourself to feel them without getting swept away or identified with them.

That which you resist, persists. I could go on, but your comment reminded me that sages and therapists have pointed to the same thing.