Faith in God is reasonable and unbelief in Him is unreasonable.
Isaiah1:18: Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.
If we reason with God we will get a correct estimation of Him and of ourselves. If we get a correct estimation of Him and of ourselves we will come to faith in Him. If we underestimate Him we will overestimate ourselves. If we overestimate ourselves we will not understand His greatness. If we reason with God the only reasonable conclusions that we can come to are that He is right and we are wrong. He is Holy and we are sinners. He is reasonable and we are unreasonable. Reasoning with Him will cause us to agree with His reasonable conclusions. It will help us to understand that we do not have the solution to our sin problem but that He does.
2 Thessalonians 3:2: And that we may be delivered from unreasonable and wicked men: for all men have not faith.
The first unreasonable and wicked man that we must be delivered from is ourself. Then He can also deliver us from a multitude of other unreasonable and wicked men. The centurion in Luke chapter 7 had a correct estimation of God AND of himself. Even Jesus marveled at his great faith.
Luke 7:6-9: Then Jesus went with them. And when he was now not far from the house, the centurion sent friends to him, saying unto him, Lord, trouble not thyself: for I am not worthy that thou shouldest enter under my roof: 7 Wherefore neither thought I myself worthy to come unto thee: but say in a word, and my servant shall be healed. 8 For I also am a man set under authority, having under me soldiers, and I say unto one, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it. 9 When Jesus heard these things, he marvelled at him, and turned him about, and said unto the people that followed him, I say unto you, I have not found so great faith, no, not in Israel.
1 Corinthians 11:31: For if we would judge ourselves, we should not be judged.
2 Corinthians 13:5a: Examine yourselves, whether ye be in the faith; . . .
Correctly judging or examining ourselves will bring us to the conclusion that we deserve condemnation and need the gift of God*s mercy. We will conclude that anything that keeps us out of Hell, temporarily or permanently, is because of God*s mercy. He most certainly wants us to know if we are headed for condemnation or paradise. If we are headed for paradise He wants us to know that and enjoy it. If His mercy is upon us He wants us to know it and enjoy it.
If your state be good, searching into it will give you that comfort of it. If your state be bad, searching into it cannot make it worse; nay, it is the only way to make it better, for conversion begins with conviction.
If we are headed for condemnation He wants us to know that so we will repent and seek his mercy, so we will be like the publican in Luke 18.
Luke 18:13: And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.