Romans 16 (KJV)

16 Salute one another with an holy kiss. The churches of Christ salute you.

17 Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.
18 For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.

19 For your obedience is come abroad unto all men. I am glad therefore on your behalf: but yet I would have you wise unto that which is good, and simple concerning evil.

20 And the God of peace shall bruise Satan under your feet shortly. The grace of our Lord Jesus Christ be with you. Amen.

2 Corinthians 10 (KJV)

3 For though we walk in the flesh, we do not war after the flesh:
4 (For the weapons of our warfare are not carnal (lustful), but mighty through God to the pulling down of strong holds;)
5 Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;
6 And having in a readiness to revenge all disobedience, when your obedience is fulfilled.
7 Do ye look on things after the outward appearance? if any man trust to himself that he is Christ's, let him of himself think this again, that, as he is Christ's, even so are we Christ's.

12 For we dare not make ourselves of the number, or compare ourselves with some that commend themselves: but they measuring themselves by themselves, and comparing themselves among themselves, are not wise.
13 But we will not boast of things without our measure, but according to the measure of the rule which God hath distributed to us, a measure to reach even unto you.
14 For we stretch not ourselves beyond our measure, as though we reached not unto you: for we are come as far as to you also in preaching the gospel of Christ:
15 Not boasting of things without our measure, that is, of other men's labours; but having hope, when your faith is increased, that we shall be enlarged by you according to our rule abundantly,
16 To preach the gospel in the regions beyond you, and not to boast in another man's line of things made ready to our hand.

17 But he that glorieth, let him glory in the Lord.
18 For not he that commendeth himself is approved, but whom the Lord commendeth.