I think the sentiment of the bolded is what gets A LOT of Christians in trouble.... that we think we're strong enough to avoid temptation, or we're strong enough to be in an unhealthy spiritual environment without being affected.
The Word of God talks a GREAT DEAL about avoiding sin, avoiding temptation, to RUN, to FLEE from unhealthy, temptuous situations. And the Lord helps us out so well by telling us through His Word about what is and is not healthy, what offends Him, and what pleases Him.
Also, I think we think that sin and temptation happens with big, grand gestures...when actually, the way down the wrong path begins with a SEED, a seed as one thought that doesn't get checked by the Word of God and then as that negative seed gets stronger and the Holy Spirit's promptings get ignored or clouded, that seed begins to grow and overtake a person so much so that the person can't even remember back to the point where things went wrong....
Galatians 5:16-26 (NKJV)
16 I say then: Walk in the Spirit, and you shall not fulfill the lust of the flesh. 17 For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish. 18 But if you are led by the Spirit, you are not under the law.
19 Now the works of the flesh are evident, which are: adultery,[
c] fornication, uncleanness, lewdness, 20 idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, 21 envy, murders,[
d] drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told
you in time past, that those who practice such things will not inherit the kingdom of God.
22 But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, 23 gentleness, self-control. Against such there is no law. 24 And those
who are Christ’s have crucified the flesh with its passions and desires. 25 If we live in the Spirit, let us also walk in the Spirit. 26 Let us not become conceited, provoking one another, envying one another.
1 Peter 2:11: 11 Beloved, I beg
you as sojourners and pilgrims, abstain from fleshly lusts which war against the soul,
Romans 7:17-19: 17 So now, (
A)no longer am I the one doing it, but sin which dwells in me.
18For I know that nothing good dwells in me, that is, in my (
B)flesh; for the willing is present in me, but the doing of the good is not. 19For (
C)the good that I want, I do not do, but I practice the very evil that I do not want.
Romans 8:4-6: 4That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
5For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. 6For to be carnally minded is death; but to be spiritually minded is life and peace.
1 John 2:15-17: 15Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him.
16For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. 17And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.