On the day of Pentecost, the Holy Spirit descended upon the Apostles andgave them "the Light and Strength to teach the nations and to proclaim Christ's Gospel.
The Holy Spirit: Giver of Truth and Grace

On Pentecost the Church receives the mission to be witnesses of Christ and we are enabled to spread and defend the faith.

Come, O Holy Spirit, come!
From your bright and blissful Home
Rays of healing light impart.

Come, Father of the poor,
Source of gifts that will endure
Light of ev'ry human heart.

You, of all consolers best,
Of the soul, most kindly Guest,
Quick’ning courage do bestow.

In hard labor You are rest,
In the heat You refresh best,
And solace give in our woe.

O most blessed Light divine,
Let Your radiance in us shine,
And our inmost being fill.