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He said that he screamed to him to wake up scarily, he said his brother is his savior, but I replied to him that he is someone who listened, most gambling addicts that I have came across have closed ears, they won't listen to you when you try to warn them or advice them.
Have you meet gamblers that are going way too deep into addiction and you try to stop them and they listen? I've never accomplished that before.
They always behaved deaf, like some spiritual power is in control.
I am ignoring the misleading title and just answer to this.
There's nothing spiritual about it. Getting trough to an addict doesn't happen by screaming, it happens by listening and conversation, but if you really want to have an effect, maybe organize intervention with closest friends and talk with the addict. But have your basis covered and learn about gambling addiction before doing that. Because shouting only drives the addict away from your influence. That could make them just hide deeper in themselves.
There are also ton of peer support groups in the internet, there were even some peer support threads here in bitcointalk if i recall correctly. Point the addict to those, he might even enjoy talking with people who understand them and are not screaming to them, but work as cautionary examples.
And needless to say on top of those, professional help gives you best results.