Fall of humanity

All human beings, except for Jesus Christ, are sinful

Ro 3:23; Heb 4:15

See also Ge 6:5; Ge 6:11–12; Ps 14:1–3; Ps 51:5; Is 64:6–7; Jn 8:7; Ro 3:9–20; Ro 5:12–19; Eph 2:1–3

Every part of a person is affected by sin

The heart

Jeremiah 17:9 LEB

The heart is deceitful more than anything else, and it is disastrous. Who can understand it?

See also Ge 6:5; Ge 8:21; 1 Sa 17:28; 2 Ch 12:14; Ps 66:18; Je 5:23; Mt 5:28; Mt 15:8; Mt 15:19

The body

Romans 6:6 LEB

knowing this, that our old man was crucified together with him, in order that the body of sin may be done away with, that we may no longer be enslaved to sin.

See also Ro 6:12–13; 1 Co 6:13; 1 Co 6:19–20

Human nature

Romans 8:5–8 LEB

For those who are living according to the flesh are intent on the things of the flesh, but those who are living according to the Spirit are intent on the things of the Spirit. For the mindset of the flesh is death, but the mindset of the Spirit is life and peace, because the mindset of the flesh is enmity toward God, for it is not subjected to the law of God, for it is not able to do so, and those who are in the flesh are not able to please God.

See also Ro 7:5; 1 Co 5:5; Ga 5:19–21; Ga 6:8; Eph 2:3

Believers are warned not to fall from grace

Hebrews 3:12–14 LEB

Watch out, brothers, lest there be in some of you an evil, unbelieving heart, with the result that you fall away from the living God. But encourage one another day by day, as long as it is called “today,” so that none of you become hardened by the deception of sin. For we have become partners of Christ, if indeed we hold fast the beginning of our commitment steadfast until the end,

See also Mt 24:12–13; 1 Co 15:2; Ga 5:4; Heb 4:11; Heb 12:15; 2 Pe 3:17; Re 2:4–5

God is able to keep believers from falling

Jude 24 LEB

Now to the one who is able to protect you from stumbling and make you to stand before his glory blameless with exultation,

See also Job 33:14–18; Ro 16:25; Eph 6:13; 1 Jn 5:18