The Liturgy of the Church is a chronological lesson on the Plan of Salvation made by God. It consists in the major mysteries in the Life of Christ which contain lessons for our imitation. The surrounding liturgies of these major mysteries explain the same mysteries in detail and how we can put them into practice.So we have a major feast of the Liturgy, Pentecost, which shows us how the Church looks like and how we can enter it. For most of us who have some fear for the salvation of our souls, our interest would be on "how to enter the Church," because our salvation would depend on it.
The answer make up the three steps celebrated in the three liturgical feasts that follow Pentecost; namely, the feast of the Blessed Trinity, Corpus Christi and Sacred Heart.
The first principle that we should know is, that souls that go to Heaven are those who love God (and neighbor.) But then, we cannot love God unless God love us first. When God loves us He creates in us the theological virtue of Charity by which we are able to love Him. So what should we do to make God love us?
Scriptures is replete with examples of those whom God loves and those whom God hates. This should expel the wrong notion that God simply loves everybody unconditionally. The Psalms state that God loves the righteous and hates the evildoers. Again God loves the humble and hates the proud; more specifically God loves Jacob and hates Esau. Of course, God does not hate in the way man hates.
Notice two words above: humble and righteous. At the beginning of the Gospels we hear Christ telling us to learn from Him for He is " ... meek and humble of heart." It is the humble person whom God draws towards Christ. The pride of a person becomes the obstacle preventing his being drawn to Christ.
When the humble person is drawn to Christ, he learns and loves the commandments of Christ, thus obeying those commands, enabling him to confess Christ, not only with his lips but with his life. This is a person with the righteousness of God, not of man, like the pharisees. That is the message of the Gospel on the feast of the Holy Trinity.
Now let us go to the Feast of Corpus Christi. The humbler a person is, the more he learns the commands of Christ or the righteousness of God. When he partakes of the Body and Blood of Christ, he does so worthily, unto Life. (The unrighteous who eats and drinks the Body and Blood of Christ, does so unto his condemnation.) And the more the righteous eats and drinks of the Body and Blood of Christ, the more is he united with Christ as a branch is united to the vine. Being then so united to the Vine, the sap, which is the Holy Spirit of Love, will more easily flow from the Vine to the branches.
With the Feast of the Sacred Heart, we should then have a final image of a true Catholic...one whose human heart (like the human heart of Christ) is hypostatically united to the Divinity of Christ, united to God the Father and God the Holy Spirit. The Beatitudes describe him as "pure in heart."
