god will open the hearts of whomever he wants to guide to islam but he will tighten the chest of one whom he has led astray as though he was climbing high up into the sky. thus god places wickedness on those who do not accept the faith.
فمن يرد الله أن يهديه يشرح صدره للإسلام ومن يرد أن يضله يجعل صدره ضيقا حرجا كأنما يصعد في السماء كذلك يجعل الله الرجس على الذين لا يؤمنون