Whether all dissimulation is a sin?

❌ Objection 1 : It seems that not all dissimulation is a sin. For it is written (Lk. 24:28) that our Lord "pretended [Douay: 'made as though'] he would go farther"; and Ambrose in his book on the Patriarchs (De Abraham i) says of Abraham that he "spoke craftily to his servants, when he said" (Gn. 22:5): "I and the boy will go with speed as far as yonder, and after we have worshipped, will return to you." Now to pretend and to speak craftily savor of dissimulation: and yet it is not to be said that there was sin in Christ or Abraham. Therefore not all dissimulation is a sin.

❌ Objection 2 : Further, no sin is profitable. But according to Jerome, in his commentary on Gal. 2:11, "When Peter [Vulg.: 'Cephas'] was come to Antioch:---The example of Jehu, king of Israel, who slew the priest of Baal, pretending that he desired to worship idols, should teach us that dissimulation is useful and sometimes to be employed"; and David "changed his countenance before" Achis, king of Geth (1 Kgs. 21:13). Therefore not all dissimulation is a sin.

❌ Objection 3 : Further, good is contrary to evil. Therefore if it is evil to simulate good, it is good to simulate evil.

❌ Objection 4 : Further, it is written in condemnation of certain people (Is. 3:9): "They have proclaimed abroad their sin as Sodom, and they have not hid it." Now it pertains to dissimulation to hide one's sin. Therefore it is reprehensible sometimes not to simulate. But it is never reprehensible to avoid sin. Therefore dissimulation is not a sin.