Sin is an offense against reason, truth, and right conscience; it is failure in genuine love for God and neighbor caused by a perverse attachment to certain goods.  Sin is disobedience against God, a revolutionary attitude and mind towards God and his commandments.  Sin is a violation against the natural law, an utterance, deed or desire contrary to eternal law.  Sin in its essence is an unlawful turning towards the creature and turning away from God.

There are seven capital sins: pride, avarice, envy, wrath, lust, gluttony and sloth (or acedia).  There are two types of sin: mortal and venial sin.  Mortal sin deprives a man of sanctifying grace, and delivers him into the power of the devil.  The Holy Spirit will not remain in a person with mortal sin on the soul.  Job 22:17 states

Wisdom 16:14 states

Romans 6:16 states

James 1:15 states that sin

Sacred Scripture and Catholic teaching give affirmation of sins that are abominable.  These sins are the sins that cry to heaven for vengeance because of their great malice.  There are four sins:

Genesis 4:10:  Willful murder; Cain killing Abel.

Exodus 2:23-Exodus 3:7:  Oppression of the poor; the oppression of the Israelites in Egypt.

Genesis 18:20:  Sodomy and Homosexuality; these sins are mortal and violate the natural law of God.  The cry of these sins reached the Lord.

Deuteronomy 24:14-15 and James 5:4:  Defrauding the worker of his wages.

Sacred Scripture give affirmative evidence of the two types of sin.  The Catholic Church has always taken the position regarding sin.  Protestantism does not separate sin.  This is certainly a violation against Biblical revelation and reason.  1 John 5:16-17 (RSV) states:

This Biblical revelation gives evidence of mortal sin.  The Catechism of the Catholic Church gives this definition of mortal sin as well.  For a sin to be mortal, three conditions must be met.

Venial sin can be described as a lesser sin in which one does not observe the standard prescribed by the moral law, or when he disobeys the moral law in a grave matter, but without full knowledge or without complete consent.  Since venial sin weakens charity, it manifests disordered affection for created goods; it impedes the soul's progress in the exercise of the virtues and the practice of moral good.  He who wittingly transgresses one of God's commandments is guilty of sin.

Sin is nothing else but revolt against and disobedience to God.  Sacred Scripture makes a clear distinction between mortal and venial sin.  Mortal sins are willful and deliberate transgressions of rebellion against the Word and commandments of God.  Venial is lesser sin that is committed unwittingly.  Genesis 18:20 gives evidence of the sins of perversity, mortal sins committed in Sodom and Gomorrah.  Genesis 19:24 gives evidence that the Lord rained fire and brimstone against Sodom and Gommorah for its sins.  In Romans 6:23, St. Paul exhorts

Leviticus 4:2-32 gives affirmative evidence and a magnificent description of venial sins, sin which is committed unwittingly while Numbers 15:27-34 provides evidence of mortal sin.  Numbers 15:32-36 gives further evidence of willful mortal sin in a man gathering sticks on the Sabbath.  After the man was brought by the congregation in front of Moses and Aaron, the Lord gave Moses the command to stone this transgressor to death.  Sacred Scripture gives evidence the congregation stoned the man to death outside the camp.

Deuteronomy 17:12 gives evidence that one who commits sin acting presumptuously by not obeying the priest who stands there to minister before the Lord, shall be put to death.  This is mortal sin, willful transgression against the law of God.  Deuteronomy 5:12 commands to observe the Sabbath day.

In Hebrews 10:26-27, St. Paul exhorts

Revelation 21:27 states that

We must repent of mortal sin!  Proverbs 24:16 gives evidence of venial sin:

Sacred Scripture gives evidence that we are all sinners, it is only by God's grace we can avoid sin.  In 1 John 1:8, St. John exhorts

In Romans 3:9, St. Paul gives evidence that all men are under the reign and the power of sin.  Concupiscence is the sensual desire for self pleasure.  From the Latin word cupere, meaning "to desire", concupiscence is the insubordination of man's desire to the dictates of reason, and the propensity of human nature to sin as a result of the sin of Adam, called original sin.  While all the will is weakened, it is not totally fallen.  The Protestant reformers, Luther and Calvin, preached total bondage and enslavement of the will.  This is alien to what the Bible teaches.  Sacred Scripture teaches that man has free will.  Joshua 24:15, Deuteronomy 30:15-19, and Sirach 15:16-17 give affirmative evidence that man has free will to choose God or to reject Him.

Let us never forget that through the grace of God we can do all things.  The grace and mercy of God is greater than any sin.  In Philippians 4:13 St. Paul exhorts

The following Scriptures give evidence whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin: Matthew 12:31-32, Mark 3:28-30, and Luke 12:10.  Blasphemy of the Holy Spirit, called the "unforgivable sin", is not a sin of offending the Holy Spirit in words, but the direct refusal to accept the salvation which the Almighty God offers in Christ Jesus through the working of the Holy Spirit, working through the blood of the cross.

Sacred Scripture gives evidence of mortal sin that leads to death.  Read Romans 1:18-32, which gives evidence of humanity without Christ, and the wrath, the punishment of God against idolaters.  In Romans 1:29:32, St. Paul testifies against

1 Corinthians 6:9-12 states

In Galatians 5:19-21, St. Paul warns

In Christ we have redemption for our sins through the power of his blood.  Ephesians 1:7, 1 Peter 1:18-19, and Revelation 1:5 witness that the redemption of sin comes through the blood of Christ.  Romans 3:21-25 and Romans 5:8-9 testify that the blood of Christ is our justification.  In John 20:21-23, Jesus gave his disciples the sacrament of penance.  This is the power to forgive sins.  Jesus exhorts

Bishops and priests are successors to the apostles.  1 John 1:9 states

Call upon the power of the blood of Christ against all sin and evil desires!

May God richly bless you!  Amen!  Hallelujah!