This time of year is the worst for mosquitos! It's one thing to deal with them outside, but you expect that when you come inside you will be safe from them. As you sit quietly, you hear one buzzing around, flying by your face and annoying you. You swat at it, but you can't see it! Then it gets quiet, did it fly away or has that little blood sucker stopped to get a drink? You'll know later when you find an itchy bump somewhere on your body. The evil of this world is the same way! Sometimes you know them because it's obvious; then there are other times you don't know until you're suffering the consequences. That's why it's important to be educated in all the forms that evil comes in, so it doesn't suck the life out of you while you're unaware. I'm not saying you should focus on evil, but the more you focus on God the more aware you are of how evil this world is. There are many false prophets and teachers out there; know the Word and you'll know the difference!
Beloved, do not believe every spirit, but test the spirits to see whether they are from God, for many false prophets have gone out into the world. 1 John 4:1