I suppose that one way in which I can be sure to pick "just the right words" is to use someone else's. So I give you here the Thanksgiving homily of Father Alexander Schmemann, delivered just before his death in 1983. This is read as the homily in the Thanksgiving Liturgy each year at St. Vladimir's (and in other parishes as well, I hear):
Everyone capable of thanksgiving is capable of salvation and eternal joy.
Thank You, O Lord, for having accepted this Eucharist, which we offered to the Holy Trinity, Father, Son and Holy Spirit, and which filled our hearts with the joy, peace and righteousness of the Holy Spirit.
Thank You, O Lord, for having revealed Yourself unto us and given us the foretaste of Your Kingdom.
Thank You, O Lord, for having united us to one another in serving You and Your Holy Church.
Thank You, O Lord, for having helped us to overcome all difficulties, tensions, passions, temptations and restored peace, mutual love and joy in sharing the communion of the Holy Spirit.
Thank You, O Lord, for the sufferings You bestowed upon us, for they are purifying us from selfishness and reminding us of the “one thing needed”: Your eternal Kingdom.
Thank You, O Lord, for having given us this country where we are free to Worship You.
Thank You, O Lord, for this school, where the name of God is proclaimed.
Thank You, O Lord, for our families: husbands, wives and, especially, children who teach us how to celebrate Your holy Name in joy, movement and holy noise.
Thank You, O Lord, for everyone and everything.
Great are You, O Lord, and marvelous are Your deeds, and no word is sufficient to celebrate Your miracles.
Lord, it is good to be here! Amen.
These were the words of a dying man. O Lord, teach us all to be so thankful for whatever You bring to us.
(If you would like to read excellent commentary on this topic, I refer you to Fr. Stephen Freeman's blog, Glory to God for All Things, in his Thanksgiving Post for this year.)