Heresy, Factions and Schisms By Protopresbyter Fr. George Papavarnavas

...Heresy creates factions and schisms, it splits and divides....
....This creates many problems, because when the faith is altered the correct way of life is lost. This way of life is the method of treating the passions, the method of the purification of the heart, by which man is led to the knowledge of God ("Blessed are the pure in heart, for they shall see God"), since the vision of God is identical with true knowledge.

thanks to source:
http://www.johnsanidopoulos.com/2014/01/saint-athanasius-great-as-model-for-our.html