When they that fed them saw what was done, they fled, and went and told it in the city and in the country.
All Commentaries on Luke 8:34 Go To Luke 8
Cyril of Alexandria
AD 444
We may also learn this from what befell the herd of swine. Wicked demons are cruel, mischievous, hurtful and treacherous to those who are in their power. The fact clearly proves this, because they hurried the swine over a precipice and drowned them in the waters. Christ granted their request that we might learn from what happened that their disposition is ruthless, bestial, incapable of being softened, and solely intent on doing evil to those whom they can get into their power. If there is anyone among us who is wanton, swinish, filth loving, impure and willingly contaminated with the abominations of sin, God permits such a one to fall into their power and sink into the abyss of damnation. It will never happen that those who love Christ will become subject to them. It will never happen to us as long as we walk in his footsteps, avoid negligence in the performance of what is right, desire those things which are honorable, and belong to that virtuous and praiseworthy lifestyle that Christ has marked out for us by the precepts of the gospel. Commentary on Luke, Homily