Can sinning have consequences over eternal life?

SINNING [in the present tense] can have consequences over ETERNAL LIFE.

Matthew 18:

Jesus said: "if your hand or your foot IS-CAUSING [in the present tense] YOU TO-FALL, cut it off and throw (it) from you. It-is better (for) you to-enter into LIFE crippled or lame than to-be-thrown into the ETERNAL FIRE having two hands or two feet" (Matthew 18:8). 

Jesus was contrasting "LIFE" (Matthew 18:8) with "ETERNAL FIRE" (Matthew 18:8), which suggests that Jesus would have been referring to ETERNAL "LIFE" (Matthew 18:8) in this passage.

Several chapters later Jesus contrasted the unrighteous ones who will go "into the ETERNAL FIRE" (Matthew 25:41) in contrast to "the righteous (ones who go) to ETERNAL LIFE" (Matthew 25:46). 

1 Corinthians 6:

An example of SIN can be all unrighteousness, as it is written in 1 John: "ALL UNRIGHTEOUSNESS [adikia 93 in Greek] IS SIN" (1 John 5:17). 

Paul described UNRIGHTEOUS people according to what they practice in the following way: "do-you not know that UNRIGHTEOUS [adikoi 94 in Greek] (ones) will not inherit God’s kingdom? Do not be-deceived. Neither SEXUALLY-IMMORAL (ones), nor IDOLATERS, nor ADULTERERS, nor (HOMO-)PASSIVE(-MALE-PARTNERS), nor (HOMOSEXUALS-)MALE-BED(ERS), nor THIEVES, nor GREEDY (ones) — not DRUNKARDS , not REVILERS, not SWINDLERS — will-inherit (the) kingdom (of) God" (1 Corinthians 6:9-10). 

Paul wrote that these "will NOT INHERIT God’s KINGDOM" (1 Corinthians 6:9). 

The only time when Jesus mentioned the terms "INHERIT" and "KINGDOM" together in all the 4 gospels was in Matthew 25, where a future judgment was described as "He-WILL-make-to-stand the sheep on His right (side), and the goats on (the) left (side)" (Matthew 25:33) and to the righteous it is said: "Come, the (ones) having-been-blessed (of) My Father, INHERIT the KINGDOM" (Matthew 25:34) and so "the righteous (ones go) to ETERNAL LIFE" (Matthew 25:46). In contrast to the unrighteous it is said: "Depart from Me, the (ones) having-been-cursed, into the eternal fire" (Matthew 25:41) and so "these will-go into eternal punishment" (Matthew 25:46).

If  "UNRIGHTEOUS (ones) will NOT INHERIT God’s KINGDOM" (1 Corinthians 6:9), then they will NOT "(go) to ETERNAL LIFE" (Matthew 25:46) because of their unrighteousness which is "SIN" (1 John 5:17). 

1 John 3:

It is written in 1 John that it is possible for ETERNAL LIFE to not abide in someone because of SINNING [in the present tense], as it reads: "Everyone HATING [in the present tense] his brother IS [in the present tense] (a) MURDERER, and you-know that EVERY MURDERER DOES NOT HAVE ETERNAL LIFE abiding in him" (1 John 3:15). 

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