I believe Paisios was right, but it's because of other things I've read from other contemporary saints. You see, spiritual people don't just go along with a thing because everybody else is doing it and has been doing it. Only those who will blindly accept the sealing in the false religion of Anti-Christ would do such a thing. You are aware that science/medicine/tech (the knowledge of man) form the foundation of Satan's church, right? If this is true, then why do you and so many others believe that a medicine cannot be a form of sealing in Anti-Christ? Or that it would not serve as a sign that we trust more in princes and sons of men in whom there is no salvation than in God, who said that sacrificing children to demons is the epitome of evil and the sign of a most wicked civilization. We of faith will accept medical care when it is moral, but we will not stand for evil ways in ourselves or others, such as the testing of things on fetal cell lines derived from sinfully sacrificed new lives in God's image and likeness, offered to demons and then offered to us. We wouldn't do it know matter if every single other Orthodox Christian in the world were to do it. We entrust our lives, or our deaths, to God, and look for the resurrection of the dead and the Life of the world to come. We will lose our life, so that we will keep it. It is God's grace that gives us this strength of spirit. My exhortation to repent as stated before stands, because the days are extremely numbered. If we take the vaccine we don't necessarily receive the mark of the Beast, but our willingness to do so is a sure indication of an inadequate spiritual life, and that will surely lead to worshipping the Beast.