An Introduction to the Devout Life continues, as we find out there’s no excuse not to try and be devoted, but that you also have a perfect right to live a devoted life in the way most appropriate for you. So there.
You’re having some technical terminology thrown at you, and concepts are being expressed in ways not usually used today. Don’t panic. Charity is “caritas”, love of God and neighbor. “Perfect” does not mean you never ever make any mistakes; it’s the biblical “perfect”, which is more like “totally equipped for the job” or “complete and well-rounded”. A lot of this stuff will be defined for you later in the text. Don’t panic.