Welcome to another slab of study in 1 Corinthians! This time, I'll expound upon Chapter 5! (Not all verses will be discussed.)
"It is reported commonly that there is fornication among you, and such fornication as is not so much named among the Gentiles, that one should have his father's wife. And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you." (1-2)
The people Paul was talking to were in unrepentant sin."Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?" (6)
We are not to allow any leaven into our Christian doctrine. For leaven shall corrupt the doctrine like a cancer, until all the parts thereof are contaminated.
Also, in a second application, we are to cast out our sins by repentance, for sins not repented for will eat us up until we are corrupt with the guilt thereof.
"Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us." (7)
Cast aside the old leaven, for the old leaven festers into a stinking rot. Embrace Christ wholly, and lean unto His understanding.
"But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner, with such an one no not to eat." (11)
You might not like this, but Paul is completely right. We are not to associate ourselves with those who commit such heinous iniquity. We are not to corrupt the Christian brotherhood with people who are Godless and reprobate.
"But them that are without God judgeth. Therefore put away from among yourselves that wicked person." (13)
We are to cast aside the old man, for he longs to chip away our morality until we are dead spiritually. Yet the old man cannot entirely contaminate us, for the Holy Spirit defends the core of our souls.
The flesh judges senselessly. The flesh hates the pride of others because of its own severe pride. The flesh is a mocker, a body of derision, and the essence of sin.