Here is a catechesis from him on the Holy Spirit:
"O my CHILDREN, how beautiful it is! The Father is our Creator, the Son is our Redeemer, and the Holy Ghost is our Guide. . . . Man by himself is nothing, but with the Holy Spirit he is very great. Man is all earthly and all animal; nothing but the Holy Spirit can elevate his mind, and raise it on high. Why were the saints so detached from the earth? Because they let themselves be led by the Holy Spirit. Those who are led by the Holy Spirit have true ideas; that is the reason why so many ignorant people are wiser than the learned. When we are led by a God of strength and light, we cannot go astray.
The Holy Spirit is light and strength. He teaches us to distinguish between truth and falsehood, and between good and evil. Like glasses that magnify objects, the Holy Spirit shows us good and evil on a large scale. With the Holy Spirit we see everything in its true proportions; we see the greatness of the least actions done for God, and the greatness of the least faults. As a watchmaker with his glasses distinguishes the most minute wheels of a watch, so we, with the light of the Holy Ghost, distinguish all the details of our poor life.
Then the smallest imperfections appear very great, the least sins inspire us with horror. That is the reason why the most Holy Virgin never sinned. The Holy Ghost made her understand the hideousness of sin; she shuddered with terror at the least fault.
Those who have the Holy Spirit cannot endure themselves, so well do they know their poor misery. The proud are those who have not the Holy Spirit.
Worldly people have not the Holy Spirit, or if they have, it is only for a moment. He does not remain with them; the noise of the world drives Him away. A Christian who is led by the Holy Spirit has no difficulty in leaving the goods of this world, to run after those of Heaven; he knows the difference between them. The eyes of the world see no further than this life, as mine see no further than this wall when the church door is shut. The eyes of the Christian see deep into eternity. To the man who gives himself up to the guidance of the Holy Ghost, there seems to be no world; to the world there seems to be no God. . . . We must therefore find out by whom we are led. If it is not by the Holy Ghost, we labor in vain; there is no substance nor savour in anything we do. If it is by the Holy Ghost, we taste a delicious sweetness . . . it is enough to make us die of pleasure!
Those who are led by the Holy Spirit experience all sorts of happiness in themselves, while bad Christians roll themselves on thorns and flints. A soul in which the Holy Spirit dwells is never weary in the presence of God; his heart gives forth a breath of love. Without the Holy Ghost we are like the stones on the road. . . . Take in one hand a sponge full of water, and in the other a little pebble; press them equally. Nothing will come out of the pebble, but out of the sponge will come abundance of water. The sponge is the soul filled with the Holy Spirit, and the stone is the cold and hard heart which is not inhabited by the Holy Spirit.
A soul that possesses the Holy Spirit tastes such sweetness in prayer, that it finds the time always too short; it never loses the holy presence of God. Such a heart, before our good Saviour in the Holy Sacrament of the Altar, is a bunch of grapes under the wine press. The Holy Spirit forms thoughts and suggests words in the hearts of the just. . . . Those who have the Holy Spirit produce nothing bad; all the fruits of the Holy Spirit are good.
Without the Holy Spirit all is cold; therefore, when we feel we are losing our fervour, we must instantly make a novena to the Holy Spirit to ask for faith and love. . . . See, when we have made a retreat or a jubilee, we are full of good desires: these good desires are the breath of the Holy Ghost, which has passed over our souls, and has renewed everything, like the warm wind which melts the ice and brings back the spring. . . . You who are not great saints, you still have many moments when you taste the sweetness of prayer and of the presence of God: these are visits of the Holy Spirit.
When we have the Holy Spirit, the heart expands - bathes itself in divine love. A fish never complains of having too much water, neither does a good Christian ever complain of being too long with the good God. There are some people who find religion wearisome, and it is because they have not the Holy Spirit."