This quote suggests that happiness can come into our lives unexpectedly, often when we least anticipate it. The metaphor of a door signifies opportunities and experiences that we may not consciously be aware of. It implies that the pursuit of happiness doesn't always require active effort or planning; sometimes, it arrives through spontaneity and openness to new possibilities. By keeping ourselves receptive and allowing life's surprises to enter, we can find joy in the most unforeseen moments.
Quote By: John Barrymore