H/T to Donald R. McClarey of The American Catholic
Sensus Fidei in the Life of the Church, Paragraph 63.
Alerted by their sensus fidei, individual believers may deny assent even to the teaching of legitimate pastors if they do not recognise in that teaching the voice of Christ, the Good Shepherd. ‘The sheep follow [the Good Shepherd] because they know his voice. They will not follow a stranger, but they will run away from him because they do not know the voice of strangers’ (Jn 10:4-5). For St Thomas, a believer, even without theological competence, can and even must resist, by virtue of the sensus fidei, his or her bishop if the latter preaches heterodoxy. In such a case, the believer does not treat himself or herself as the ultimate criterion of the truth of faith, but rather, faced with materially ‘authorised’ preaching which he or she finds troubling, without being able to explain exactly why, defers assent and appeals interiorly to the superior authority of the universal Church.