Romans 16:18 For men of that stamp are not bondservants of Christ our Lord, but are slaves to their own appetites; and by their plausible words and their flattery they utterly deceive the minds of the simple. (See RSV)
Romans 16:19 Your fidelity to the truth is everywhere known. I rejoice over you, therefore, but I wish you to be wise as to what is good, and simple-minded as to what is evil. (WEY)
Proverbs 1:4 To make the simple-minded sharp, and to give the young man knowledge, and serious purpose: (BBE)
Proverbs 1:22 How long, ye simple ones, will ye love simplicity? and the scorners delight in their scorning, and fools hate knowledge? (See NAS)