We have some of his writings on
Saints' Books!

'Now answer me candidly, when you are going to the church to hear Mass, do you bear in mind that you are going to Calvary to be present at the Redeemer's death? If this thought was deep in your soul, would you venture into the holy place with unbecoming gait, or in apparel that is immodest? Had Magdalene come to the foot of the cross on Calvary, bedizened, perfumed, and with a display of finery such as she wore in the time of her sinfulness, what would have been said of her? Now what are we to say of you who go to the holy place dressed out as for some merry-making? What should be said of you if you were to profane that most august sacrifice by unbeseeming conduct, such as nods, salutations, laughter, whisperings, or worse than all, lascivious and sacrilegious glancings? Iniquity is abominable on all occasions and in all places, but the sins that are committed during Mass, and under the shadow of the altar, are sins which call down God's signal maledictions, "Cursed be he who doeth the work of the Lord deceitfully." (Jer. xlviii. 10.)'
St. Leonard of Port Maurice
'If you practice the holy exercise of Spiritual Communion a good many times each day, within a month you will see yourself completely changed.'
St. Leonard of Port Maurice
'Poor souls! How can you run so hastily toward hell? For mercy's sake, stop and listen to me for a moment!'
St. Leonard of Port Maurice
'Go into street and square, into palace and house, into city and countryside, into tribunal and court of law, and even into the temple of God. Where will you find virtue? "Alas!" cries Salvianus, "except for a very little number who flee evil, what is the assembly of Christians if not a sink of vice?" All that we can find everywhere is selfishness, ambition, gluttony, and luxury. Is not the greater portion of men defiled by the vice of impurity, and is not Saint John right in saying, "The whole world - if something so foul may be called - "is seated in wickedness?" I am not the one who is telling you; reason obliges you to believe that out of those who are living so badly, very few are saved.'
St. Leonard of Port Maurice
'Have you considered what the holy sacrifice of the Mass really is? It is the sun of Christianity, the soul of Faith, the centre of the Catholic religion, the grand object of all her rites, ceremonies, and Sacraments; in a word, it is the condensation of all that is good and beautiful in the Church of God.'
St. Leonard of Port Maurice