2 Tim. 3:5-9 (ESV)
having the appearance of godliness, but denying its power. Avoid such people.  For among them are those who creep into households and capture weak women, burdened with sins and led astray by various passions,  always learning and never able to arrive at a knowledge of the truth.  Just as Jannes and Jambres opposed Moses, so these men also oppose the truth, men corrupted in mind and disqualified regarding the faith.  But they will not get very far, for their folly will be plain to all, as was that of those two men.
“Always learning and never able to arrive at a knowledge of truth.” Oh, how sick society is today. I can’t tell you how sick I am of people telling me that doctrine doesn’t matter, because we can’t be completely right. No one has the whole truth. They use this to defend their own insecurities, while at the same time holding to doctrines that have been shown to be false. They will quote “For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall know fully, even as I have been fully known.” (1 Cor. 13:12 (ESV) They see it as a mark of spiritual pride that someone believes they are so right they have the audacity to correct and rebuke another for false doctrine, as Paul instructs Timothy to do. This is a wholly corrupt way of looking at scripture, that prays on weak women, and effeminate men.
Paul, is not giving license in 1 Cor. 13:12 to doubt doctrines as they are clearly laid out in Scripture. There is truth that we can arrive at, even as we spend a lifetime learning the Christian faith. The truth is Christ, He is true and so are his words. Luther’s Small Catechism for instance, distills the truths of the Christian faith from Scripture. It is a bedrock of truth. We can know these truths, even as we constantly learn more about them. Sasse, once wrote something to the effect that the Christian faith is simple enough for the youngest child, and the most mentally handicapped to believe and know, while at the same time being rich enough that the Thomas Aquinases, Martin Luthers, and Augustines of the world can spend a life time learning and never plumb its depths. But to not even be able to say of Christ’s words, in light of his resurrection, that this is most certainly true, leads one to uncertainty. There are things that will be revealed to us in heaven, things we believe to be true, but have a hard time understanding will be cleared up for us in heaven. In the meantime, we do have truth, we have arrived at it through the grace of Christ, and his clear word recorded in Scripture. There is no reason to doubt his word even if we do have a hard time understanding it. The Trinity is a prime example of one such doctrine, so is baptism and the Lord’s Supper. There is truth, and we can arrive at it, and should have no problem proclaiming it, and critiquing others on the basis of it. If their doctrine clearly contradicts scripture it is false. To say no one can have it all right, as an excuse to hold onto false doctrine is despicable and unbecoming of a Christian.