How does one reasonably justify his or her existence?

Question:

How does one reasonably justify his or her existence?

Best Answer - Chosen by Asker: Some may give simple answers like, "Have children and perpetuate the species," and the like. I believe that each individual must justify their own existence in their own way.

This question can only be answered with more questions, because the answer varies from person to person.

1) What do you believe your life's purpose to be?
2) Do you believe you were created by a supernatural entity (like God, Allah, or another Deity)? If you do, what do you believe this Deity wants you to do with your life?

...and so on.

Once you've answered these questions for yourself, you'll have a better handle on the reason you exist.

Good luck!