Even so, a day may come when our lives depend on them.

Giving life to the idea depends on every one of us.

If someone didn't find him soon, his life would depend on moving yet again.

After all, our lives depend on him doing real well.

The lives of your families and friends depend on it.

Not when his life, and the lives of others, might very well depend upon it.

And you better play like your life depends on it now!

The lives of his friends depended on what he did now.

You can make a case that people's lives might depend on any of these.

Of course, his own life depended upon its being so.