Once I'm gone, what then will provide you with a reason for your existence?

At least he would fight for his existence with her.

If everything needs a cause for its existence, then so does God.

So he does not need a cause for his existence.

If we could only point to a reason for existence.

We have not yet seen them in action, but there must be a reason for their existence.

As of 2010, there is no evidence for their existence.

Most people will never touch one, which is why they see no reason for its existence.

To his way of thinking this was the reason for man's existence.

Their only reason for existence was to be the place that I would come to.