Fear those who behave like angels more than the already condemned ones. The truth is that the condemned ones are already painted black and suspected of all evil. Because of that, they can be good or bad at the same time.
The angel that you know can cause the mess that you never suspected. They appear like angels publicly and turn devilish in the darkness. The evil that you know is better than the angel you don’t know.
Though you can trust someone but be careful, consider the number of times that you deceived someone that you strongly promised.