the.com/ideas
The mind's offspring — free to conceive, expensive to raise.
means Mental constructs, plans, or thoughts that exist before anything is built, said, or proven.
from From Greek idea, meaning form or pattern — Plato's blueprint reality from which all visible things are imperfect copies.
Cheap supplyWorthless without execution; markets pay for the doing.
Plato's worldHe thought ideas were realer than objects.
Sudden strikesBest ones arrive in showers, not meetings.