Three and a half years ago I woke up on a Thursday morning in the first week of August, and I felt as though I had almost no strength. I sat up, and I began to sweat and fell backwards into bed. The boss was out of town and I was supposed to open for the day. Fortunately my wife was able to go to the store and open for me and then help out for the day. (She works there part time.)
She had to leave me alone, and I got worse. I began to get too dizzy to stand up or walk. I was so dizzy that I was getting sick while lying down. I would close my eyes and could still feel things swirling, and the nausea began to grow worse.
I was sick for the rest of the day and didn't really feel right for the next day. I wouldn't feel right for more than six months. As it turns out, two days after I'd awoken that Thursday, I'd found a large red lump on the back of my neck, and a few days later, I went to the doctor. He examined the lump and told me that I had been bitten by a spider. He didn't really know what type, but suggested three possibilities. He said we couldn't know unless we had seen the corpse. So as it turns out I must have been bitten in my sleep.
I was warned that this bite might weaken my immune system. Evidently it did. In the twenty years previous to having been bitten, I had contracted precisely three colds. In the weeks following the bite, I'd caught five or six colds, and by the end of October, on Halloween Day, I was in the doctor's office with the worst flu I'd ever had. I missed over three weeks of work and I made several trips back to the doctor with it, ending up with pneumonia, having to take seven medications and use an inhaler before it was over. I had terrible ear aches with it, and coughed so uncontrollably that I brought up blood. The ear aches returned two months later and had to be fought off again.
I managed to build my immune system back up again by taking amino acids and using some vitamins. I haven't had a cold since, and I feel like I did, prior to getting bitten.
Today when I threw my jeans into the washing machine, I saw a large dark brown spider sitting inside the door seal. My head about sank into my neck.
Once again, my wife came to my rescue, and got a pair of kitchen tongs to extract the furry little thing and speed it to its death, at my watchful insistence, from a discreet distance. About five feet. Sigh. I have been near spiders since and killed them immediately, but having it so near me, and getting caught by surprise brought me face to face with how much I really hate the experience I went through, and how much I want to avoid going through it again.
I mean, here I was, able to do whatever I wished, and then this little thing crept into my life and suddenly my body was poisoned and what I could do was very inhibited, and my life was totally interrupted by it.
Sin is like that too. You can be healthy in the Lord, enjoying a robust walk with Him, and enjoying His presence every day, and then some seemingly little sin creeps in and poisons your heart, distracting you from Him and interrupting that walk. You can start to slip from being able to even feel his presence, much less enjoying it.
The thing is, if we ever let that happen to us, with Jesus, there is no having to use drugs to get well. You don't have to build your soul back up with amino acids and vitamins. You simply have to repent, to 'turn away' from that 'little' sin. You turn away from it, and turn to Him. He forgives us and restores us. He made sure that could happen for us when He did His work for us on the Cross, because He knew we had sinned, and that we would sin again.
The Apostle Paul stated in 1st Timothy 1:15, that he was the chief of sinners. In Romans Chapter 7, Paul elaborates on the potentially devastating conflict between God's grace, and the corruption in our hearts, and the way God's law and the law of sin are so opposed.
Our souls are sanctified, 'set apart' for His use, but here, in this place, we are still susceptible to sin, and if Paul was the 'chief' of sinners, I ask you, what hope is there for someone like me to have a good walk with the Lord? I mean, 1st John 1, verse 10, John even tells us;
10 If we say that we have not sinned, we make Him a liar, and His word is not in us.

But take heart, and look at the verse that comes right before that one.

9 If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.

Isn't that wonderful? We can rest assured that when we do miss the mark, and when we do allow something hairy and ugly to creep into our lives, all we have to do is turn from it, and confess it. Its ugliness and its damaging venom will be washed from our souls.

1 There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the Spirit. 2 For the law of the Spirit of life in Christ Jesus has made me free from the law of sin and death. Romans 8:1,2 NKJV