How ridiculous and how strange to be surprised at anything which happens in life.
Marcus Aurelius kept a mental list of all the ways people fail — betrayals, greed, anger — not to judge, but to prepare. By expecting imperfection from the world, he protected his peace. When a friend lied or an official embezzled, he didn't explode. He simply nodded and moved forward. This mindset — to expect life's thorns along with its roses — is what gave him strength to lead without bitterness.
Expect life to be imperfect. Prepare your response instead of wasting energy on surprise.
"When you are offended at any man's fault, turn to yourself and study your own failings. Then you will forget your anger."