The letter Placuit Deo, addressed to the bishops of the Catholic Church, and, more generally, to all the faithful, intends to “explain, in the spirit of Dominus Iesus, what Christian salvation means” with par ticular reference to the teachings of Pope Fran- cis. It is intended to “help the faithful rediscover the beauty, the fascination, of belonging to Christ and to the Church, which is the essence of the whole path of Evangelization”. The Holy Father often speaks about two tendencies which are similar to two ancient heresies – Pelagianism and Gnosticism –. The present letter is intended to deal with these reductionist tendencies that threaten today’s Christianity, pointing out that salvation consists in our union with Christ.