Just then there was in their synagogue a man with an unclean spirit, and he cried out, ‘What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are, the Holy One of God.’ But Jesus rebuked him, saying, ‘Be silent, and come out of him!’ And the unclean spirit, throwing him into convulsions and crying with a loud voice, came out of him. (Mark 1: 23-26)

Good and evil have a relationship. When the truly evil encounters the truly good, evil recognizes the power of the good and good understands the power of evil.

Most of us do not make a choice. We are neither good nor evil. Our understanding is dulled. We easily confuse good and evil. Or more likely, fail to recognize either.

If we are fortunate enough to be near the good we will tend to be good. If we happen to be found by evil we as easily abide with it.

Those in the synagogue were aware that Jesus was outside their common experience. But they reacted mostly with uncertainty. What is this? Who is this?

The evil spirit was quick and true in recognizing that Jesus had been consecrated of God. Conscious choice brings clarity. Clarity leads to understanding. Dear God, be in my choosing.

"Just then" is a translation of euthus.