"In Homily 27, St. Isaac the Syrian speaks of two kinds of confidence. The first kind of confidence is what we generally mean when we say someone is confident. That is, the person is sure about what he or she is doing or saying. St. Isaac tells us that this kind of confidence is spiritually dangerous. It is dangerous because we live in an age of changeability, or 'ununiformity' as it is translated in the Holy Transfiguration edition of St. Isaac’s text.This ununiformity refers to the mutability or inconstancy we experience in this world. Things and people don't stay the same."