Very related to Get curious. The principle is: if I’m feeling energy to do a thing right in this moment, do it!
This principle doesn’t outright forbid “not striking while the iron is cold”—though it indirectly supports notions like A rigid fixation on “focus” can harm creative work by suggesting that if the iron is hot with some consistency, you might as well strike then and do something else now. If the iron does not consistently become hot, the inverse maxim does not apply; see instead Just get started for next steps.