Satan plays unkind thoughts in our mind, and we allow it. Most often, those unkind thoughts play like movies, and we don’t think to stop them.
You have authority over your unkind thoughts. Cast them down with the word of God.
II Corinthians 10:5 (KJV) – casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ.
Proverbs 23:7 (KJV) – for as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.