Many people don't understand the difference. They think because they know of Him that's enough. It's not! Knowing of Him only gets you pointed in the right direction and that's it! You have to get to know Him for yourself by developing a personal relationship, prayer life, studying the Word, etc. Anything else is knowing of Him, which won't get you into Heaven. It is why you always hear preachers, etc doing worldly things, because they only know of Him. When you know Him you change from your old ways!
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