Certainty about something brings a sense of security, but is certainty possible in matters of belief? Skeptics often recoil at the confidence Christians have in knowing that God exists, that the Bible is His message to us, and that His way is the only acceptable way to live. The nerve of those Christians! How arrogant to express such certainty about such things! Can we be “absolutely certain” of things like the existence of God, life after death, and so forth? Or are they like childhood beliefs in Santa Claus that will be seen through inevitably? Let’s work through that today.
To an extent I will grant the skeptic their case against absolute certainty, although probably not for the reason they might hope. True “absolute” certainty is only possible with exhaustive, comprehensive knowledge. However, that is called omniscience, and only God possesses it. Therefore, technically, I would say absolute certainty exists but is impossible for us mere mortals, finite as we are. However, it’s “all in who you know”, as they say, and I would offer that the Christian doesn’t need to possess that ultimate level of certainty because he knows the One who does. God, speaking through the prophet Isaiah, said, “I am God, and there is no one like Me, declaring the end from the beginning, and from ancient times things which have not been done, saying, ‘My purpose will be established, and I will accomplish all My good pleasure'” [Is 46:9-10]. I know the Writer of this grand play, so whether or not I know how the next scene will unfold, I can be certain of how it ends (spoiler alert: God wins), and I can rest easy in that knowledge. As Dr. Douglas Groothuis said, “we can live wisely within ignorance if it is bracketed by knowledge.”
Now, I said I would grant the skeptics their rejection of absolute human certainty, but does this mean that I don’t think Christians can be “certain” about the One whom they have staked their life on? Hardly. Absolute certainty comes with complete knowledge, which is God’s alone, but knowledge is something we may possess to varying degrees, just as we may be loving or merciful or holy to a degree, while God possesses all these attributes perfectly. Just because we aren’t perfectly loving like God, doesn’t mean we can’t understand and demonstrate love to a great degree. Likewise, we may have a more than sufficient confidence about various things in life, even if we can never attain absolute certainty. How certain can we be of things? I would suggest that our certainty is proportional to the authority from which we receive our information. For instance, if you were looking for information on finite element analysis for structural design (an interest of mine), and your choices were between me and Edward Wilson, you would hopefully go with Wilson, one of the key figures in the development of that analysis method. You could have far greater certainty in the veracity of his statements than mine given that he really did “write the book” on that now-common method of analysis. You could have more confidence in my statements on the subject the more I referenced legitimate authorities on the subject like him, or demonstrated that my statements matched up with cold, hard reality via testing or logical necessity. The closer we get to legitimate authority on a subject, the closer we get to certainty about it. The closest I can get to absolute certainty in life is when I rely on the all-knowing Author of life itself.
Of course, if it were just a matter of knowledge of data, I could misinterpret the data, just as 2 scientists can look at the same data and interpret it quite differently depending on the assumptions they bring to the table. However, it’s not data we have come to know, but rather a personal, relational Creator who knew us better than we know ourselves before we were even born. And He has set His Holy Spirit in us [Gal 4:6] as a testimony [Rom 8:16], a seal [2Co 1:22], and a pledge [2Co 5:5, Eph 1:14]. This is why the apostle Paul could speak so forcefully when he stated, “I know whom I have believed and I am convinced that He is able to guard what I have entrusted to Him until that day.” [2Ti 1:12] This is why John summed up his purpose in writing his first letter thusly: “These things I have written to you who believe in the name of the Son of God, so that you may know that you have eternal life.” [1Jn 5:13] This assurance for the Christian comes not from turning a blind eye to evidence the skeptic thinks contradicts our beliefs, but rather from “Christ in you, the hope of glory” [Col 1:27], and that is a hope that does not disappoint [Rom 5:5] .
Am I absolutely certain that God exists and the Bible is His true revelation of Himself to us, and that Jesus Christ is the Son of God? Due to my finitude, I would say I can’t be absolutely certain of that. But I would also say that I’m far more certain of those things than I am of my sitting here in front of a computer typing these words. I could be in a coma right now dreaming about blogs and office deadlines and commuting and all the other thousand little things in what I consider my daily life, living out my own little version of The Matrix. But even in that extreme case, when all of the external world around me is questionable, I still have the evidence of His Spirit in me, and I still know that God necessarily exists, that His Word endures forever, and that “my Redeemer lives”! And I’ll take that degree of certainty, absolute or not, over anything else this world has to offer. Blessings, y’all.
 h/t to Bruce Waltke, in his lecture series on the Book of Proverbs, featured on www.biblicaltraining.org for this insight. See his lecture, “Hermeneutica Sacra“.
 Douglas Groothuis, Walking Through Twilight: A Wife’s Illness – A Philosopher’s Lament (Downers Grove: Intervarsity Press, 2017), p. 49.