"The fun is in the day" is an old proverb that fits this card perfectly. The Fool card may come into play when everyone around you is wary of something and you're going to take a chance on it. For example, "Oh, I think it's a good time to change jobs, there are unemployed people everywhere out there!" Or "What! You two split up? What the hell were you thinking?"
Take a chance! Do it no matter what. The Fool implies that the path to fulfillment is through spontaneous action, while long-term plans are for the future.
Relationship significance
In relationship analysis, the Fool suggests a period of living in the moment or taking things as they come. You may be about to elope, or meet a partner while traveling, or are about to meet a partner who prefers the present to planning for the future.