Does ‘willful sinning’ threaten my salvation?
Well, if anyone reads their Bible and believes what it says plainly the answer to this question is clearly a resounding... "yes."
"For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins." (Hebrews 10:26).
"he that commits sin is of the devil." (1 John 3:8).
"everyone who does evil hates the light." (John 3:20).
"But your iniquities have separated between you and your God, and your sins have hid his face from you, that he will not hear." (Isaiah 59:2).
“...whosoever shall say, Thou fool, shall be in danger of hell fire.”
(Matthew 5:22).
28 “But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
29 And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
30 And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.” (Matthew 5:28-30).
“But whoso committeth adultery with a woman lacketh understanding: he that doeth it destroyeth his own soul.” (Proverbs 6:32).
“But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.” (Matthew 6:15).
“22 On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’
23 And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’” (Matthew 7:22-23 ESV).
“26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.”
(Matthew 7:26-27).
“Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.” (Matthew 7:21)
Important Note: If you were to look at 1 Thessalonians 4:3 you would learn that the will of God (i.e. the Father) is to be holy or it is our sanctification; And Hebrews 12:14 says, without holiness no man shall see the Lord.
"Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him." (1 John 3:15).
“For by thy words thou shalt be justified, and by thy words thou shalt be condemned.” (Matthew 12:37).
"They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate." (Titus 1:16).
3 "If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;
4 He is proud, knowing nothing,..." (1 Timothy 6:3-4).
"...God resisteth the proud, but giveth grace unto the humble."
(James 4:6).
21 For if God spared not the natural branches, take heed lest he also spare not thee.
22 Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off." (Romans 11:21-22).
"He that saith he is in the light, and hateth his brother, is in darkness even until now." (1 John 2:9).
"In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother." (1 John 3:10).
41 "The Son of Man will send his angels, and they will gather out of his kingdom all causes of sin and all law-breakers,
42 and throw them into the fiery furnace. In that place there will be weeping and gnashing of teeth.
43 Then the righteous will shine like the sun in the kingdom of their Father. He who has ears, let him hear." (Matthew 13:41-43 ESV).
"But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death." (Revelation 21:8).
19 "Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God." (Galatians 5:19-21).
5 "Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affe
ction, evil concupiscence, and covetousness, which is idolatry:
6 For which things' sake the wrath of God cometh on the children of disobedience:
7 In the which ye also walked some time, when ye lived in them." (Colossians 3:5-7).
5 “...God;
6 ...will render to every man according to his deeds:
7 To them who by patient continuance in well doing seek for glory and honour and immortality, eternal life:
8 But unto them that are contentious, and do not obey the truth, but obey unrighteousness, indignation and wrath,
9 Tribulation and anguish, upon every soul of man that doeth evil, of the Jew first, and also of the Gentile;
10 But glory, honour, and peace, to every man that worketh good, to the Jew first, and also to the Gentile:
11 For there is no respect of persons with God.
12 For as many as have sinned without law shall also perish without law: and as many as have sinned in the law shall be judged by the law” (Romans 2:5-12).
“But when the righteous turneth away from his righteousness, and committeth iniquity, and doeth according to all the abominations that the wicked man doeth, shall he live? All his righteousness that he hath done shall not be mentioned: in his trespass that he hath trespassed, and in his sin that he hath sinned, in them shall he die.” (Ezekiel 18:24).
9 “Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God. “ (1 Corinthians 6:9-10).