And I, brethren, when I came to you, did not come with excellence of speech or of wisdom declaring to you the testimony of God. 2 For I determined not to know anything among you except Jesus Christ and Him crucified. 3 I was with you in weakness, in fear, and in much trembling. 4 And my speech and my preaching were not with persuasive words of human wisdom, but in demonstration of the Spirit and of power, 5 that your faith should not be in the wisdom of men but in the power of God. (ICor. 2:1-5)
5 Walk in wisdom toward those who are outside, redeeming the time. 6 Let your speech always be with grace, seasoned with salt, that you may know how you ought to answer each one.
(Col 4:5-6)
But as for you, speak the things which are proper for sound doctrine: 2 that the older men be sober, reverent, temperate, sound in faith, in love, in patience; 3 the older women likewise, that they be reverent in behavior, not slanderers, not given to much wine, teachers of good things— 4 that they admonish the young women to love their husbands, to love their children, 5 to be discreet, chaste, homemakers, good, obedient to their own husbands, that the word of God may not be blasphemed.6 Likewise, exhort the young men to be sober-minded, 7 in all things showing yourself to be a pattern of good works; in doctrine showing integrity, reverence, incorruptibility, 8 sound speech that cannot be condemned, that one who is an opponent may be ashamed, having nothing evil to say of you.
9 Exhort bondservants to be obedient to their own masters, to be well pleasing in all things, not answering back, 10 not pilfering, but showing all good fidelity, that they may adorn the doctrine of God our Savior in all things.
11 For the grace of God that brings salvation has appeared to all men, 12 teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age, 13 looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ, 14 who gave Himself for us, that He might redeem us from every lawless deed and purify for Himself His own special people, zealous for good works.
15 Speak these things, exhort, and rebuke with all authority. Let no one despise you.(Titus 2:1-15)
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Last Days of the Age 
I love scripture [and this, inspired by God and in reference to the verses you quoted].
I am reminded also of a verse: “For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek,” (Romans 1:16).
And yes, brother, there is no better time to cling to the nail-scarred hand than when witnessing.