A Prayer of Thanksgiving By St Basil The Great
O Existing One, Master Lord, God, almighty and adorable Father: It is truly meet and right and befitting the majesty of Thy holiness that we should praise Thee, hymn Thee, bless Thee, worship Thee, give thanks unto Thee and glorify Thee, the only truly existing God, and offer unto Thee with contrite heart and spirit of humility this our rational worship; for Thou art He that hath graciously bestowed upon us the knowledge of Thy truth. 
And who is sufficient to speak of Thy mighty acts, to make all Thy praises to be heard, or to tell of all Thy wonders at every season? 
O Master of all, Lord of heaven and earth, and of all creation both visible and invisible, Who sittest upon the throne of glory and beholdest the depths, Who art unoriginate, invisible, immutable, the Father of our Lord: the great God and Savior Jesus Christ, our Hope, Who is the Image of Thy goodness, the Seal of equal type, in Himself showing forth Thee, the Father, the living Word, the true God, the Wisdom before all ages, the Life, Sanctification, Power, the true Light, through Whom the Holy Spirit was manifested: the Spirit of truth, the Gift of adoption, the Pledge of the inheritance to come, the First-fruits of eternal good things, the life-giving Power, the Fountain of sanctification, by Whom enabled every rational and intelligent creature doth serve Thee and ascribe to Thee perpetual praise, for all things are Thy servants. 
Filled thus with great awe at Thine immeasurable mercies and love, do Thou receive the unfeigned praise and thanksgiving of our unworthy hearts for all that Thou hast provided for us in this world and the next, and enable us to walk before Thee in holiness and purity all the days of our life in fitting gratitude for Thy loving-kindness to us; 
For blessed art Thou O Holy Father together with Thy Son, our Lord Jesus Christ to Whom, with Thee and the Holy Spirit, be all honor and glory and worship, now and every and unto ages of ages. 
Amen.