I John 2:4 says, “Now by this we know that we know Him, if …”
I’ll leave the rest of the scripture for you to look up. Remember to read it in its context.
In the meantime, try this video on for size. This short video has a kick and it’s worth the beating. Whether you’re familiar with Paul Washer or not, check out on Youtube what is referred to has his shocking youth message. But it’s not just for youth.