1 In the preceding Lecture, according to our ability we set before you, our beloved hearers, some small portion of the testimonies concerning the Holy Ghost; and on the present occasion, we will, if it be God's pleasure, proceed to treat, as far as may be, of those which remain out of the New Testament: and as then to keep within due limit of your attention we restrained our eagerness (for there is no satiety in discoursing concerning the Holy Ghost), so now again we must say but a small part of what remains.
For now, as well as then, we candidly own that our weakness is overwhelmed by the multitude of things written. Neither today will we use the subtleties of men, for that is unprofitable; but merely call to mind what comes from the divine Scriptures; for this is the safest course, according to the blessed Apostle Paul, who says, Which things also we speak, not in words which man's wisdom teaches, but which the Holy Ghost teaches, comparing spiritual things with spiritual. Thus we act like travellers or voyagers, who having one goal to a very long journey, though hastening on with eagerness, yet by reason of human weakness are wont to touch in their way at various cities or harbours.
Source: Catechetical Lectures (New Advent)