And since infants are men, and as such need salvation, needing salvation they need also Baptism. And those that are not regenerated, since they have not received the remission of hereditary sin, are, of necessity, subject to eternal punishment, and consequently cannot without Baptism be saved. So that even infants should, of necessity, be baptized. Moreover, infants are saved, as is said in Matthew; {Matthew 19:12} but he that is not baptized is not saved. And consequently even infants must of necessity be baptized. And in the Acts {Acts 8:12; 16:33} it is said that the whole houses were baptized, and consequently the infants. To this the ancient Fathers also witness explicitly, and among them Dionysius in his Treatise concerning the Ecclesiastical Hierarchy; and Justin in his fifty-sixth Question, who says expressly, “And they are guaranteed the benefits of Baptism by the faith of those that bring them to Baptism.” And Augustine says that it is an Apostolic tradition, that children are saved through Baptism; and in another place, “The Church gives to babes the feet of others, that they may come; and the hearts of others, that they may believe; and the tongues of others, that they may promise;” and in another place, “Our mother, the Church, furnishes them with a particular heart.”
Now the matter of Baptism is pure water, and no other liquid. And it is performed by the Priest only, or in a case of unavoidable necessity, by another man, provided he is Orthodox, and has the proper intention to Divine Baptism. And the effects of Baptism are, to speak concisely, firstly, the remission of the hereditary transgression, and of any sins of any kind that the baptized may have committed. Secondly, it delivers him from the eternal punishment, to which he was liable, as well for original sin and for mortal sins he may have individually committed. Thirdly, it gives to the person immortality; for in justifying them from past sins, it makes them temples of God.
The Confession of Dositheus (Eastern Orthodox)