"Abide", and "observe my commandments". "Observe" only comes second. "Abide" comes first, at the ontological level, namely that we are united with him, he has given himself to us beforehand and has already given us his love, the fruit. It is not we who must produce the abundant fruit; Christianity is not moralism, it is not we who must do all that God expects of the world but we must first of all enter this ontological mystery: God gives himself. His being, his loving, precedes our action and, in the context of his Body, in the context of being in him, being identified with him and ennobled with his Blood, we too can act with Christ.
Ethics are a consequence of being: first the Lord gives us new life, this is the great gift. Being precedes action and from this being action then follows, as an organic reality, for we can also be what we are in our activity. Let us thus thank the Lord for he has removed us from pure moralism; we cannot obey a prescribed law but must only act in accordance with our new identity. Therefore it is no longer obedience, an external thing, but rather the fulfilment of the gift of new life.
I say it once again: let us thank the Lord because he goes before us, he gives us what we must give, and we must then be, in the truth and by virtue of our new being, protagonists of his reality. Abiding and observing: observing is the sign of abiding and abiding is the gift that he gives us but which must be renewed every day of our lives.
(Pope Benedict, Lectio at PSRM 12 February 2010) [more]