You become immersed in your former emotions to the point where you can distinguish their flavor, and then you realize where the emotion comes from. It's like you're filtering, separating out your heart.
安安靜靜一個人在遙遠的異鄉，好像整個人「浸泡」在前半生遺留的情緒裡；浸久了分辨出滋味，體察出來源，這才能像過濾了一般，把一顆心析離出來。