When we know someone REALLY well (like our parents, best friends, significant others, etc.), we have to be careful. We know their strengths, but we also know their weaknesses, which means we can exploit them. With great power comes great responsibility.
The devil knows Jesus very well. In yesterday’s Gospel, we witnessed the devil’s attempt to get Jesus to give into temptation. He knows Jesus so well, that he knew exactly which buttons to push. Jesus left this exchange and had to be ministered to by angels because it took so much out of Him. What’s scary is that we are nowhere near as strong as Jesus, but the devil knows us just as well.
The devil knows our fears, our hurts, and our sin. He uses them to keep us separated from Jesus. He fans the flames of fear by saying God won’t be there for us. He fans the flames of hurt by saying God wasn’t there for us. And he fans the flames of sin by saying God isn’t there right now (and doesn’t need to be). There is only one thing we can do (and it’s guaranteed to work): run to Jesus in prayer and the Sacraments. He always wins.