Colossians 2:8 See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the elemental spiritual forces of this world rather than on Christ.
One of the worst feelings we can have is when someone throws doubt into our minds and makes us doubt something we have believed in for a long time.
This is why it can be hard to get through to some people about the Gospel – because they have believed a lie for so long and trust in that lie.
But being able to open someone’s eyes and ears to the truth is very rewarding as they realise the truth for themselves.