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An idea has arrived with some heat behind it. The Ace is the beginning of something you actually want to do, before anyone has asked you what the plan is, and its only real suggestion is to act on it while it's still warm.
Reversed
Reversed, the spark isn't catching. Often the idea has been described so many times that the enthusiasm for it is spent, or there's energy about with nowhere useful to go.
If this is your card this month
What idea have you been describing instead of starting?
A card is a prompt rather than a forecast. It doesn't know what will happen, and the useful part is what you do with the question it hands you. We make that case at more length in not a prediction, a mirror.