It is from the Greek word εὐχαριστία, meaning thanksgiving, that Christianity derives the word eucharist. Thus it would seem especially appropriate to observe this United States civic holiday of Thanksgiving for Our Lord’s blessings and protection by assisting at the Holy Sacrifice of the Mass.
The Collect of the traditional Votive Mass of Thanksgiving — equally suitable, as rendered below, for a devotional prayer after Holy Communion — reminds us of all we have to be thankful for.
Deus, cuius misericordiæ non est numerus, et bonitatis infinitus est thesaurus: piissimæ maiestati tuæ pro collatis donis gratias agimus, tuam semper clementiam exorantes: ut qui petentibus postulata concedis, eosdem non deserens, ad præmia futura disponas.
Deus, qui corda fidelium Sancti Spiritus illustratione docuisti: da nobis in eodem Spiritu recta sapere, et de eius semper consolatione gaudere.
Deus, qui neminem in te sperantem nimium affligi permittis, sed pium precibus præstas auditum; pro postulationibus nostris, votisque susceptis gratias agimus, te piissime deprecantes, ut a cunctis semper muniamur adversis. Per Christum Dominum nostrum. Amen.
O God of Whose mercies there is no number, and of Whose goodness the treasure is infinite: we render thanks to Thy most gracious Majesty for the gifts Thou hast bestowed upon us, always beseeching Thy clemency; that as Thou grantest the petitions of them that ask Thee, Thou wilt never forsake them, but wilt prepare them for the greater rewards that still await them.
O God, Who hast taught the hearts of the faithful by the light of the Holy Spirit, grant that, by the gift of the same Spirit, we may be always truly wise, and ever rejoice in His consolation.
O God, Who allowest no one that puts his trust in Thee to be stricken beyond endurance but givest a gracious hearing to his prayer, we thank Thee for having granted our petitions; and we pray that we may be delivered henceforth from all harm. Through Christ our Lord. Amen.