If a Pope clearly realizes that he is no longer physically, psychologically, and spiritually capable of handling the duties of his office, then he has a right and, under some circumstances, also an obligation to resign.

To me, it really seems visible today that ethics is not something exterior to the economy, which, as technical matter, could function on its own; rather, ethics is an interior principle of the economy itself, which cannot function if it does not take account of the human values of solidarity and reciprocal responsibility.

Liberty isn't liberalism, arbitrariness, but it's connected; it's conditioned by the great values of love and solidarity and in general by the good.

Pope Benedict XVI Quotes