St. Irenaeus (2nd Century) on the Uniform Teaching of the Church, Truth is to be found nowhere else but in the Church and that Many questions must be left in the Hands of God.
From Book III, Chapter 24 - ...The Uniform Teaching of the Church, which remains so always, and is consistent with itself
...the preaching of the Church is everywhere consistent, and continues in an even course, and receives testimony from the prophets, the apostles, and all the disciples-as I have proved-through [those in] the beginning, the middle, and the end, and through the entire dispensation of God, and that well-grounded system which tends to man's salvation, namely, our faith; which, having been received from the Church, we do preserve, and which always, by the Spirit of God, renewing its youth, as if it were some precious deposit in an excellent vessel, causes the vessel itself containing it to renew its youth also. For this gift of God has been entrusted to the Church, as breath was to the first created man, for this purpose, that all the members receiving it may be vivified; and the [means of] communion with Christ has been distributed throughout it, that is, the Holy Spirit, the earnest of incorruption, the means of confirming our faith, and the ladder of ascent to God. "For in the Church," it is said, "God hath set apostles, prophets, teachers," (I Cor 12:28) and all the other means through which the Spirit works; of which all those are not partakers who do not join themselves to the Church, but defraud themselves of life through their perverse opinions and infamous behaviour. For where the Church is, there is the Spirit of God; and where the Spirit of God is, there is the Church, and every kind of grace; but the Spirit is truth. Those, therefore, who do not partake of Him, are neither nourished into life from the mother's breasts, nor do they enjoy that most limpid fountain which issues from the body of Christ; but they dig for themselves broken cisterns (Jer. 2:13) out of earthly trenches, and drink putrid water out of the mire, fleeing from the faith of the Church lest they be convicted; and rejecting the Spirit, that they may not be instructed.
- Alienated thus from the truth, they do deservedly wallow in all error, tossed to and fro by it, thinking differently in regard to the same things at different times, and never attaining to a well-grounded knowledge, being more anxious to be sophists of words than disciples of the truth. For they have not been founded upon the one rock, but upon the sand, which has in itself a multitude of stones....
From Irenaeus, Against All Heresies, Book 3, Chapter IV
...Since therefore we have such proofs, it is not necessary to seek the truth among others which it is easy to obtain from the Church; since the apostles, like a rich man [depositing his money] in a bank, lodged in her hands most copiously all things pertaining to the truth: so that every man, whosoever will, can draw from her the water of life. (Rev. 22:17). For she is the entrance to life; all others are thieves and robbers. On this account are we bound to avoid them, but to make choice of the thing pertaining to the Church with the utmost diligence, and to lay hold of the tradition of the truth. For how stands the case? Suppose there arise a dispute relative to some important question among us, should we not have recourse to the most ancient Churches with which the apostles held constant intercourse, and learn from them what is certain and clear in regard to the present question? For how should it be if the apostles themselves had not left us writings? Would it not be necessary, [in that case,] to follow the course of the tradition which they handed down to those to whom they did commit the Churches?
From Against all Heresies, Book II, Chapter 28
- ... we have learned from the Scriptures that God holds the supremacy over all things. But whence or in what way He produced it, neither has Scripture anywhere declared; nor does it become us to conjecture, so as, in accordance with our own opinions, to form endless conjectures concerning God, but we should leave such knowledge in the hands of God Himself. In like manner, also, we must leave the cause why, while all things were made by God, certain of His creatures sinned and revolted from a state of submission to God, and others, indeed the great majority, persevered, and do still persevere, in [willing] subjection to Him who formed them, and also of what nature those are who sinned, and of what nature those who persevere,-[we must, I say, leave the cause of these things] to God and His Word, to whom alone He said, "Sit at my right hand, until I make Thine enemies Thy footstool." (Ps. 110:1) But as for us, we still dwell upon the earth, and have not yet sat down upon His throne. For although the Spirit of the Saviour that is in Him "searcheth all things, even the deep things of God," (1 Cor. 2:10) yet as to us "there are diversities of gifts, differences of administrations, and diversities of operations; "(1 Cor 12:4-6) and we, while upon the earth, as Paul also declares, "know in part, and prophesy in part."(1 Cor. 13:9) Since, therefore, we know but in part, we ought to leave all sorts of [difficult] questions in the hands of Him who in some measure, [and that only, ] bestows grace on us. That eternal fire, [for instance, ] is prepared for sinners, both the Lord has plainly declared, and the rest of the Scriptures demonstrate. And that God fore-knew that this would happen, the Scriptures do in like manner demonstrate, since He prepared eternal fire from the beginning for those who were [afterwards] to transgress [His commandments]; but the cause itself of the nature of such transgressors neither has any Scripture informed us, nor has an apostle told us, nor has the Lord taught us. It becomes us, therefore, to leave the knowledge of this matter to God, even as the Lord does of the day and hour [of judgment], and not to rush to such an extreme of danger, that we will leave nothing in the hands of God, even though we have received only a measure of grace [from Him in this world]. But when we investigate points which are above us, and with respect to which we cannot reach satisfaction, [it is absurd] that we should display such an extreme of presumption as to lay open God, and things which are not yet discovered, (Gen 40:8; Deut. 39:39; Ps. 130:1) as if already we had found out, by the vain talk about emissions, God Himself, the Creator of all things, and to assert that He derived His substance from apostasy and ignorance, so as to frame an impious hypothesis in opposition to God.