How to Conduct oneself during Holy Mass

"In order to avoid irreverence and imperfections in the house of God, in church — which the Divine Master calls the “house of prayer” — I exhort you in the Lord to practice the following:

Enter the church in silence and with great respect, considering yourself unworthy to appear before the Lord’s Majesty. Among other pious considerations, remember that our soul is the temple of God and, as such, we must keep it pure and spotless before God and his angels. Let us blush for having given access to the devil and his snares many times (with his enticements to the world, his pomp, his calling to the flesh) by not being able to keep our hearts pure and our bodies chaste; for having allowed our enemies to insinuate themselves into our hearts, thus desecrating the temple of God which we became through holy Baptism.

Then take Holy Water and make the Sign of the Cross carefully and slowly.

As soon as you are before God in the Blessed Sacrament, devoutly genuflect. Once you have found your place, kneel down and render the tribute of your presence and devotion to Jesus in the Blessed Sacrament. Confide all your needs to Him along with those of others. Speak to Him with filial abandonment, give free rein to your heart, and give Him complete freedom to work in you as He thinks best.

When assisting at Holy Mass and the sacred functions, be very composed when standing up, kneeling down, and sitting, and carry out every religious act with the greatest devotion. Be modest in your glances; don’t turn your head here and there to see who enters and leaves. Don’t laugh, out of reverence for this holy place and also out of respect for those who are near you. Try not to speak to anybody, except when charity or strict necessity requests this.

If you pray with others, say the words of the prayer distinctly, observe the pauses well, and never hurry. In short, behave in such a way that all present are edified by it and, through you, are urged to glorify and love the heavenly Father.

On leaving the church, you should be recollected and calm. Firstly take your leave of Jesus in the Blessed Sacrament; ask his forgiveness for the shortcomings committed in his Divine presence and do not leave him without asking for and having received his paternal blessing.

Once you are outside the church, be as every follower of the Nazarene should be. Above all, be extremely modest in everything, as this is the virtue which, more than any other, reveals the affections of the heart.

Nothing represents an object more faithfully or clearly than a mirror. In the same way, nothing more widely represents the good or bad qualities of a soul than the greater or lesser regulation of the exterior, as when one appears more or less modest.

Fr. Pio, Capuchin