Whether disobedience is the most grievous of sins?

❌ Objection 1 : It seems that disobedience is the most grievous of sins. For it is written (1 Kgs. 15:23): "It is like the sin of witchcraft to rebel, and like the crime of idolatry to refuse to obey." But idolatry is the most grievous of sins, as stated above (Question [94], Article [3]). Therefore disobedience is the most grievous of sins.

❌ Objection 2 : Further, the sin against the Holy Ghost is one that removes the obstacles of sin, as stated above (Question [14], Article [2]). Now disobedience makes a man contemn a precept which, more than anything, prevents a man from sinning. Therefore disobedience is a sin against the Holy Ghost, and consequently is the most grievous of sins.

❌ Objection 3 : Further, the Apostle says (Rm. 5:19) that "by the disobedience of one man, many were made sinners." Now the cause is seemingly greater than its effect. Therefore disobedience seems to be a more grievous sin than the others that are caused thereby.