Deception is when someone else causes you to believe something that is untrue. Delusion is a false or irrational belief that you hold yourself.
In these days of ‘fake news’ and deliberate misinformation, we are all subjected to propaganda, and it is hard to determine what is true and what is false.
It is understandable for people to be deceived when so much false information is given to us, but the best defence against deception is the truth.
Jesus said, “I am the way, the truth and the life” so when things don’t accord with his word, reject it! If things sit uncomfortably in your spirit, then doubt it. Check it out with the word of God and trusted friends.
In some ways delusion is self-deception. You convince yourself that something is so because you either want to, and it suits you to believe it, or because you haven’t taken the time to check it out.
The Bible talks about this further in 2 Thessalonians 2:10 where it explains that deception is used to fool many people on their way to destruction, as they don’t want to accept the truth which will save them.
The antidote to deception or delusion is the truth. Jesus is the TRUTH.