Whether the sin of the highest angel was the cause of the others sinning?

❌ Objection 1 : It would seem that the sin of the highest angel was not the cause of the others sinning. For the cause precedes the effect. But, as Damascene observes (De Fide Orth. ii), they all sinned at one time. Therefore the sin of one was not the cause of the others' sinning.

❌ Objection 2 : Further, an angel's first sin can only be pride, as was shown above (Article [2]). But pride seeks excellence. Now it is more contrary to excellence for anyone to be subject to an inferior than to a superior; and so it does not appear that the angels sinned by desiring to be subject to a higher angel rather than to God. Yet the sin of one angel would have been the cause of the others sinning, if he had induced them to be his subjects. Therefore it does not appear that the sin of the highest angel was the cause of the others sinning.

❌ Objection 3 : Further, it is a greater sin to wish to be subject to another against God, than to wish to be over another against God; because there is less motive for sinning. If, therefore, the sin of the foremost angel was the cause of the others sinning, in that he induced them to subject themselves to him, then the lower angels would have sinned more deeply than the highest one; which is contrary to a gloss on Ps. 103:26: "This dragon which Thou hast formed---He who was the more excellent than the rest in nature, became the greater in malice." Therefore the sin of the highest angel was not the cause of the others sinning.