 Now the dictates of conscience can either be right, if correctly deduced from the natural law, or wrong, if they are incorrectly deduced. The dictates of the former are the product of a “correct conscience” and the judgements of the latter are the result of an “erroneous conscience”. Since synderesis is infallible, the main source of an erroneous conscience, when it does occur, is the agent’s adoption of a faulty minor premise in the practical syllogism (De veritate q. 17, a. 2; Potts trans. 1980: 132–133).