Investments: do things now that you can withdraw joy from later
Eilers learned this from a scuba diving trip with his father at age 17, during his worst depression. Despite being in an objectively amazing situation — clear water, colorful fish — he felt nothing. He consciously noted, 'This is a really awesome experience; it should feel that way too,' but the emotion died before reaching his feelings. He took pictures anyway, a behavior unusual for him then. Years later, looking at those photos, he feels genuine joy about having been there, even though he experienced zero joy at the time. This taught him that the absence of in-the-moment enjoyment does not make an experience a waste. He encourages people to treat such activities as investments: you pay in now (effort without reward) and can withdraw later when your emotional bank reopens. He cautions against catastrophizing ('I ruined it') and emphasizes that you don't control when the bank opens; you only control whether you've made deposits.
He suggests that emotional encoding and retrieval may not be matched to the original experience. The brain can later reinterpret memories with positive affect when the hedonic system is functional, akin to a delayed emotional processing.
The scuba diving trip with his father when 17, during severe depression. He felt no joy at the time but now finds joy from the pictures. He also notes that he was nocturnally depressed then, which limited activities, yet the investment still paid off.
I remember thinking, this is a really awesome experience and I remember thinking it should feel that way too … I could feel that that it just died before it reached my emotions and I was consciously aware that this was a neat thing that was happening, but I felt nothing from it. … I still have those pictures. When I look back on those pictures now, I feel joy about having been on the trip even though I did not.

