Front Page Titles (by Subject) QUESTION IV.: OF THE VIRTUE OF FAITH. - Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1)
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QUESTION IV.: OF THE VIRTUE OF FAITH. - St. Thomas Aquinas, Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1) 
Aquinas Ethicus: or, the Moral Teaching of St. Thomas. A Translation of the Principal Portions of the Second part of the Summa Theologica, with Notes by Joseph Rickaby, S.J. (London: Burns and Oates, 1892).
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OF THE VIRTUE OF FAITH.
Article VIII.—Is faith more certain than science?
R. Considering certitude in respect of its motive, that position is said to be the more certain which has the more certain motive. Thus considered, faith is more certain than science; because faith rests on divine truth, science on human reasoning. In another way certitude may be considered with respect to the subject who is certain. In this way that is said to be more certain which the human intellect more fully grasps. At this rate, seeing that articles of faith are above human understanding, but not articles of science, faith from this point of view is the less certain. Hence, absolutely speaking, faith is the more certain of the two; but science is the more certain in a restricted sense, that is, in reference to us.
§ 2. Other things being equal, sight is more certain than hearing; but if the person from whom a thing is heard is a much better authority than the eyesight of the witness, under that condition hearing is more certain than sight. Thus a man of little knowledge is more certainly assured of what he hears from a man of science, than he is of what seems to him according to his own reasoning. Much more is man more certain of what he hears from God, who cannot be deceived, than of what he sees by his own reasoning, which may be deceived.