"And they were not able to resist the wisdom and the spirit by which he spake." (Acts 6:10)
This has been for a while so heavy on my heart. Then a revived conviction came from God with I Thes. 5:22 and I have just been working on praying for a silent tongue. That Jesus would cover and filter my words and allow only the ones that would bring him glory to be spoken (and even thought!) I also have been praying for a consciousness of my appearance. Because it is so important that we be perceived not only as different from non-believers but that we portray our gladness for being saved. We are God's handy work, his propaganda in a loose way.