"The mind is the most restless, unruly part of mankind... Open yourself to My radiant Presence, letting My Light permeate your thinking. When My Spirit is controlling your mind, you are filled with Life and Peace." (116)
This is a great way to determine if our thoughts are of God...are they filled with Life and Peace? I often check my thoughts against the Fruit of the Spirit.(Gal. 5:22-23)
Policing our thought life requires a determined discipline. "Taking every thought captive to make it obedient to Christ." (2 Cor.10:5)
I do best when I communicate often with God about my thoughts. This means, I confess and repent often, too. The slightest indication of a dark or disturbing, fearful thought is snagged and brought before Him as soon as I am aware. I try to not let my thoughts ruin the landscape of my mind. Making them "obedient to Christ" is something like corralling unruly children and insisting they must obey! Naughty kids cannot run our lives, neither can naughty thoughts bully us around and ruin our day!
Keeping a close eye on what wanders through my brain...dmc