It's applies to a lot of teachings, does't it? The New Testament gives many answers to the question of how to be saved. Better obey them all! Start with selling all you have and give it to the poor. Oh, that was a one-time thing, just for that one guy? How can you be so sure? Maybe it doesn't apply to everyone, just to some. Maybe you! And even if it's just a principle for us to learn, as I've been told, that this fellow was so attached to his wealth, that Jesus zeroed in on that one thing. What one thing do you have that you're very attached to? Money? House? Kids? Don't take chances!
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty