Summa Theologiae / Questions on God Quotes

“As was said above...there does not fall under the scope of God's omnipotence anything that implies contradiction. Now that the past should not have been implies a contradiction. For as it implies a contradiction to say that Socrates is sitting, and is not sitting, so does it to say that he sat, and did not sit. But to say that he did sit is to say that it happened in the past. To say that he did not sit, is to say that it did not happen. Whence, that the past should not have been, does not come under the scope of divine power.”
― Thomas Aquinas, Summa Theologiae / Questions on God

“To sin is to fall short of a perfect action; hence to be able to sin is to be able to fall short in action, which is repugnant to omnipotence.”
― Thomas Aquinas, Summa Theologiae / Questions on God