Catechism of the Catholic Church

Prayer is a vital necessity. Proof from the contrary is no less convincing: if we do not allow the Spirit to lead us, we fall back into the slavery of sin. How can the Holy Spirit be our life if our heart is far from him? > Nothing is equal to prayer; for what is impossible it makes possible, what is difficult, easy.... For it is impossible, utterly impossible, for the man who prays eagerly and invokes God ceaselessly ever to sin. > Those who pray are certainly saved; those who do not pray are certainly damned.