Sensus fidei (sense of the faith), also called sensus fidelium (sense of the faithful) when exercised by the body of the faithful as a whole, is "the supernatural appreciation of faith on the part of the whole people, when, from the bishops to the last of the faithful, they manifest a universal consent in matters of faith and morals". Quoting the document Lumen gentium of the Second Vatican Council, the Catechism of the Catholic Church adds: "By this appreciation of the faith, aroused and sustained by the Spirit of truth, the People of God, guided by the sacred teaching authority (Magisterium),... receives... the faith, once for all delivered to the saints... the People unfailingly adheres to this faith, penetrates it more deeply with right judgment, and applies it more fully in daily life."
The terms sensus fidei fidelium (sense of the faith on the part of the faithful) and sensus fidei fidelis (sense of the faith on the part of an individual member of the faithful) are also used.
The Second Vatican Council made it clear that sensus fidelium (sense of the faithful) does not mean sensus laicorum (sense of the lay people), as if it were a charism granted to the laity in isolation from the Catholic Church hierarchy, and as if the clergy were not included among "the faithful". It stated:
The entire body of the faithful, anointed as they are by the Holy One, cannot err in matters of belief. They manifest this special property by means of the whole people's supernatural discernment in matters of faith when "from the Bishops down to the last of the lay faithful" they show universal agreement in matters of faith and morals. That discernment in matters of faith is aroused and sustained by the Spirit of truth. It is exercised under the guidance of the sacred teaching authority, in faithful and respectful obedience to which the people of God accepts that which is not just the word of men but truly the word of God.
It declared that Christ fulfils his prophetic office "not only through the hierarchy who teach in His name and with His authority, but also through the laity whom He made His witnesses and to whom He gave understanding of the faith [sensus fidei] and an attractiveness in speech so that the power of the Gospel might shine forth in their daily social and family life.
In a speech to the International Theological Commission on 7 December 2012, Pope Benedict XVI distinguished between the authentic meaning of sensus fidei and a counterfeit understanding: "It is certainly not a kind of public ecclesial opinion, and invoking it in order to contest the teachings of the Magisterium would be unthinkable, since the sensus fidei cannot be authentically developed in believers, except to the extent in which they fully participate in the life of the Church, and this demands responsible adherence to the Magisterium, to the deposit of faith.