Without the Holy Spirit nothing that exists, visible or invisible, could be created: because in every creation, that is, in every external operation of God, the three divine persons must necessarily concur: God the Father creates through the Word by the Holy Spirit.
Without the Holy Spirit no rational creature can glorify God and obtain merits.
Without the Holy Spirit no one can believe, nor hope, nor love, nor repent.
Without the Holy Spirit no one can recognize all the deceptions coming from our human nature, from the world and from Satan.
Without the Holy Spirit no one can observe the divine law or discern the Spirit of God.
Without the Holy Spirit the rational creation is in the state of God’s misfortune.
Finally, Saint Paul writes in the letter to Corinthians, that “no one speaking by the Spirit of God calls Jesus accursed, and no one can say that Jesus is Lord except by the Holy Spirit” (12:3).
Since man has such a need for the Holy Spirit, he invokes him often: he invokes him for help during temptation, he invokes him for light in the examination of conscience, he invokes him before hearing the Word of God, he invokes him in state of tribulation, invokes him before meditation, invokes him before speaking, invokes him in sickness, invokes him in doubt or in obscure things, invokes him in the time of fear, invokes him in the time of trial , he invokes him during desolation, he invokes him to discern his calling, he invokes him for direction in the spiritual life, he invokes him for forgiveness and for the remission of sins, he invokes him in adversity, he invokes him in the time of anxiety, and the Holy Spirit listens to him firstly because he seeks his glory, secondly because Jesus Christ merited us his grace and finally because he who humbles himself and who trusts in God should not expect confusion. If God himself tells us to invoke him, isn’t it clear that he wants to bestow him on us? Veni, Sancte Spiritus!