According to the Church, Fortitude is a Natural Virtue

That means you don’t have to be baptized or a believer to have it.

If so, why is there also a spiritual gift of fortitude that comes with the sacrament of Confirmation?

Here’s why.

The Glory of Kings and the Killing of Cats
Paul the Convert
It's Part II of the Catholic Religion Quiz!
It's Part I of the Catholic Religion Quiz