on this day you taught the hearts of your faithful people
by sending them the light of your Holy Spirit.
By that same Spirit
give us a right judgment in all things
that we may always rejoice in his holy comfort;
through your Son, Jesus Christ our Lord,
who with you and the Holy Spirit lives and reigns,
one God, now and forever.
Source: Historic collect for Pentecost, Gregorian
Original in Latin:
Deus, qui hodierna die corda fidelium Sancti Spiritus illustratione docuisti: da nobis in eodem Spiritu recta sapere, et de ejus sember consolatione gaudere.
Cranmer 1459 has it as:
GOD, whiche as upon this daye haste [hast] taughte the heartes of thy faithful people, by the sending to them the lyght of thy holy spirite; graunte us by the same spirite to have a right judgement in al thinges, and evermore to rejoyce in hys holy coumforte; through the merites of Christ Jesus our saviour; who liveth and reigneth with thee, in the unitie of the same spirite, one God, worlde without ende.