Every June 30th we hear this wonderful Gospel from St. Matthew 10:16-22, which is my personal favorite. Probably because it nails it. If you read the Acts of the Apostles, all of this that Christ warns about came to pass from the earliest years of the Church.
"At that time, Jesus said to His disciples: Behold, I send you as sheep in the midst of wolves. Be ye therefore wise as serpents, and simple as doves. But beware of men: for they will deliver you up in councils, and they will scourge you in their synagogues. And you shall be brought before governors and before kings, for My sake, for a testimony to them and to the Gentiles. But when they shall deliver you up, take no thought how or what to speak; for it shall be given you in that hour what to speak: for it is not you that speak, but the Spirit of your Father that speaketh in you. The brother also shall deliver up the brother to death, and the father the son; and the children shall rise up against the parents, and shall put them to death; and you shall be hated by all men for My name's sake: but he that shall persevere to the end, he shall be saved."
-Jesus of Nazareth