Unbelieving thought is ultimately reduced to two positions, both of which end in absurdity:
Rationalism--I only believe in things that the human mind can give an account of. Unfortunately, this position depends on man's finite mind knowing the infinite in an exhaustive, infallible way from all eternity, and able to apply that knowledge perfectly. In other words, for man to know anything, he must know everything. Man does not know everything, therefore, he cannot know anything.
Further, when faced with data that does not fit his scheme, the rationalist will either say that the data doesn't exist, or give up his sceme altogether. In short, the rationalist quickly becomes irrational.
Irrationalism--The human mind realizes its finitude and says that man cannot know anything. But can it know that it doesn't know anything? I can deny that we can even know the truth of irrationalism. But if I do this, then one must renounce any attempt to convince others that you are right. Although you can say this, can you really live that way? I don't know anything but I don't even know that I can know that.
Rather than deny that I know the truth altogether. One can become insane, if you will. What's teh problem with that? God's word can reach even the mental hospital!!!!!!!!! His rational word can make even that difference!
When God's grace draws after you, you cannot resist. You cannot say no to him in whom all the promises of God are yes and amen. Do you remember the words of Francis Thompson?
I fled Him, down the nights and down the days;
I fled Him, down the arches of the years;
I fled Him, down the labyrinthine ways
Of my own mind; and in the mist of tears
I hid from Him, and under running laughter.
Up vistaed hopes I sped;
And shot, precipitated,
Adown Titanic glooms of chasmèd fears,
From those strong Feet that followed, followed after.
But with unhurrying chase,
And unperturbèd pace,
Deliberate speed, majestic instancy,
They beat -- and a voice beat
More instant than the Feet --
"All things betray thee, who betrayest Me."