( `O you who believe! Guard your own souls: if you follow [right] guidance no hurt can come to you from those who stray . . .') (Qur'an 5:105) and you are misinterpreting it.
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For this reason it was encouraged in the Qur'an: ( And keep your soul content with those who call on their Lord morning and evening, seeking His Face, and let not your eyes pass beyond them,
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So they responded to him, this visit bore fruits of guidance, and the Prophet (PBUH) left praising Allah (SWT) that a soul had been saved from the Fire.
http://www.gowister.com/books/the-ideal-muslimah-566.html
The boy was lifted up to him, and his soul was making a sound like water being poured into an empty container (i.e., the death-rattle).
http://www.gowister.com/books/the-ideal-muslimah-567.html
according to the wise guidance it gives her in all aspects of life and in the forming of her mind, soul, psyche, morals and behaviour.
http://www.gowister.com/books/the-ideal-muslimah-569.html