how to recognize if someone is evil

As children of God, we need to be wise and to be careful as well, with who we associate ourselves with!
A Christian should be smarter and wiser than the children of darkness! We are called to read, to research, to study hard the Scriptures and also everything that is useful to us and that can help us to improve our life!
That's my firm conviction that we can outsmart the children of the devil and show to the world that those that belong to Jesus are smarter, wiser and more knowledgeable than anyone else.
There are people out there that are evil! There are people that are sent by satan in our life! As God sends people in our life, so does the evil one does!
Lets see how we can recognize them!
Bible verse
Proverbs 4:6-7
Do not forsake wisdom, and she will protect you; love her, and she will watch over you. Wisdom is supreme; therefore get wisdom. Though it cost all you have, get understanding. (NIV)