This Sunday is the Sunday after the Ascension. In the period from the Ascension to Pentecost, we meditate on the glory of Our Lord's Ascension, but we also prepare ourselves for the descent of the Holy Spirit at Pentecost. The propers for this Sunday indicate this duality (which are the same in the Ordinary and Extraordinary Forms).
Note: In many dioceses, the Ascension is not a Holy Day of Obligation. When this happens, the Ascension is celebrated on Sunday in the Ordinary Form (and in that case, this Sunday is not celebrated). In the Extraordinary Form, it is also possible to celebrate the Ascension this Sunday when it is not a Holy Day of Obligation. However, in the Extraordinary Form, these propers will still get used on any day Monday-Friday of the following week where another feast does not supersede the feria. (For example. this year, these propers will be used on Monday, since the only other celebration on May 10 is a commemoration.)
Ant. Hear, O Lord, my voice, with which I cried to Thee, alleluia: my heart has said to Thee: I have sought Thy face, O Lord - Thy face which I shall seek: do not turn Thy face away from me, alleluia, alleluia.
V. The Lord is my light and my salvation: whom shall I fear?
V. Glory be...
Ant. God has ascended in jubilation, and the Lord with the sound of a trumpet, alleluia.
Ant. Father, while I was with them, I kept them whom Thou gavest Me, alleluia: but now I come to Thee: I pray not that Thou shouldst take them out of the world, but that Thou shouldst keep them from evil, alleluia, alleluia.