The meaning of "You don't know what a person's life means until they have lived it out" suggests that understanding someone's life requires a comprehensive view of their entire journey.

Isolated incidents or fleeting moments provide only limited insights. To truly comprehend the depth and significance of someone's existence, we must consider their experiences, challenges, and growth over time.

It's through the accumulation of these moments that a person's true essence and the meaning of their life can be discerned.