He sitteth alone and keepeth silence… – Lamentations 3:28

I commend solitude to any of you who are seeking salvation, first, that you may study well your case as in the sight of God. Few men truly know themselves as they really are. Most people have seen themselves in a looking-glass, but there is another looking-glass, which gives true reflections, into which few men look. To study one’s own self in the light of God’s Word, and carefully to go over one’s condition, examining both the inward and the outward sins, and using all the tests which are given us in the Scriptures, would be a very healthy exercise; but how very few care to go through it! Yet, beloved friends, if it be a wise thing to look well to your business, how much more ought you to look to the business which concerns your immortal souls! If a true shepherd will not neglect his flocks and his herds, should not a wise man care about his thoughts, his feelings, and his actions? Must it not be a wretched condition not to know whether one is saved or not? I sometimes hear people express surprise if they are asked whether they are saved; yet in what ignorance of your own soul’s state must you be if you have never put that question to yourself, or if, when it is put, you feel inclined to give no answer to it! I press this matter home upon you, and if you would be saved, you must know first that you are lost. If you would seek to be healed, you must first learn that you are sick. It is not possible that you will repent unless you are aware of your sin; it is not likely that you will look to Christ unless you first know what it is for which you are to look to Him. Therefore, I pray you, set apart some season every day, or at least some season as often as you can get it, in which the business of your mind shall be to take your longitude and latitude, that you may know exactly where you are. You may be drifting towards the rocks, and you may be wrecked before you know your danger. I implore you, do not let your ship go at full steam through a fog; but slacken speed a bit, and heave the lead, to see whether you are in deep waters or shallow. I am not asking you to do more than any kind and wise man would advise you to do; do I even ask you more than your own conscience tells you is right? Sit alone a while, that you may carefully consider your case. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2468.cfm