Archimandrite Vasileios of Iveron on baptism by immersion 

by Andrea Elizabeth

“In the Orthodox Church, a baby, and Orthodox child, is fully immersed, enveloped by the water, and the baptism in the name of the Father and the Son and the Holy Spirit. He is not sprinkled. And this symbolism, this practice has a theological significance. Saint Cosmas of Aitolia used to tell his priests to baptize the child by complete immersion in the water, because the tiniest part of his body that is not covered by the water, that is where the devil will try to enter him. This sanctification of the soul and body is not spoken of among the Roman Catholics.”

from The Thunderbolt of Ever-Living Fire