From "Thoughts for Each Day of the Year," St. Theophan the Recluse, Sunday of Holy Pentecost.
The economy of our salvation has been accomplished! The operations of all the Persons of the Most Holy Trinity have henceforth come into effect to accomplish it. That which God the Father willed, the Son of God has fulfilled in Himself, and the Holy Spirit has now descended in order to impart it to the faithful. For our salvation is according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the Blood of Jesus Christ (1Pet 1:2). For this reason we are baptized in the name of the Father, and of the Son, and of the Holy Spirit, obliged to observe all things whatsoever He has commanded us (Mat 28:19-20). Those who do not confess the Most Holy Trinity cannot participate in the saving action of Its Persons and thus receive salvation. Glory to the Father adn to the Son and to the Holy Spirit, the Trinity one in essence and undivided, Who grants us to confess It! O Father Almighty and Word and Spirit, one Nature united in three Persons, transcendent and most Divine! Into You have we been baptized, and You shall we bless throughout all ages!