The first is an external force, the second an internal one. The third is not even real; nonetheless, it is very dangerous.
فَيَلْزَمُ أَنْ نَعْرِفَ مَا هِيَ هذِهِ ٱلْمُؤَثِّرَاتُ ،‏ وَكَيْفَ يُسَاعِدُنَا أَبُونَا ٱلسَّمَاوِيُّ عَلَى مُقَاوَمَتِهَا .‏