It's so easy to wish that we'd made an effort in the past, so that we'd happily be enjoying the benefit now, but when now is the time when that effort must be made, as it always is, that prospect is much less inviting.
Gretchen Rubin (2012). “Happier at Home: Kiss More, Jump More, Abandon Self-Control, and My Other Experiments in Everyday Life”, p.136, Harmony