Because the Master of Catholic Truth ought not only to teach the
proficient, but also to instruct beginners (according to the Apostle:
As Unto Little Ones in Christ, I Gave You Milk to Drink, Not Meat--
1 Cor. iii. 1, 2)--we purpose in this book to treat of whatever
belongs to the Christian Religion, in such a way as may tend to the
instruction of beginners. We have considered that students in this
Science have not seldom been hampered by what they have found written
by other authors, partly on account of the multiplication of useless
questions, articles, and arguments; partly also because those things
that are needful for them to know are not taught according to the
order of the subject-matter, but according as the plan of the book
might require, or the occasion of the argument offer; partly, too,
because frequent repetition brought weariness and confusion to the
minds of the readers.

Endeavoring to avoid these and other like faults, we shall try, by
God's help, to set forth whatever is included in this Sacred Science
as briefly and clearly as the matter itself may allow.
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SUMMA THEOLOGICA

FIRST PART
["I," "Prima Pars"]
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QUESTION 1

THE NATURE AND EXTENT OF SACRED DOCTRINE
(in Ten Articles)