To what extent can Satan and/or evil spirits influence our minds? As is often the case, there are extremes to avoid, I think. One extreme...

James 1:14-15 - "But every man is tempted, when he is drawn away of his own lust, and enticed. Then when lust hath conceived, it bringeth...

The sanctified are sometimes in heaviness through manifold temptations if need be. Now don't infer, if you see them so, that they are not...