That grouchy boss or that ill-tempered co-worker are not your adversaries. Those in-laws that seem to always find fault? They’re not your adversaries.
People may be part of your tests and trials—that’s adversity. However, they are not your adversary; so don’t treat them as such. Pray for them. It’s hard to stay angry with or give the “cold shoulder” to someone for whom you are truly praying.
Though adversities and trials make come in many forms (and faces), you have only one Adversary: Satan. He will use adversities to try and destroy you. We must recognize this and not lose our focus.
“Be sober, be vigilant; because your adversary the devil walks about like a roaring lion, seeking whom he may devour.” —1 Peter 5:8 (NKJV)
“For though we walk in the flesh, we do not war according to the flesh. For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts itself against the knowledge of God, bringing every thought into captivity to the obedience of Christ,” —2 Corinthians 10:3-5 (NKJV)