New Revised Standard Version
Anyone who claims to know something does not yet have the necessary knowledge;

Contemporary English Version
In fact, people who think they know so much don't know anything at all.

New American Bible
If anyone supposes he knows something, he does not yet know as he ought to know.

Douay-Rheims Bible
And if any man think that he knoweth any thing, he hath not yet known as he ought to know.

And if any man think that he knoweth any thing, he hath not yet known as he ought to know.

if.

Proverbs 26:12 Hast thou seen a man wise in his own conceit? there shall be more hope of a fool than of him.

Proverbs 30:2-4 I am the most foolish of men, and the wisdom of men is not with me. . . .

Romans 11:25 For I would not have you ignorant, brethren, of this mystery (lest you should be wise in your own conceits) that blindness in part has happened in Israel, until the fulness of the Gentiles should come in.

Galatians 6:3 For if any man think himself to be some thing, whereas he is nothing, he deceiveth himself.

1 Timothy 1:5-7 Now the end of the commandment is charity from a pure heart, and a good conscience, and an unfeigned faith. . . .

1 Timothy 6:3,4 If any man teach otherwise and consent not to the sound words of our Lord Jesus Christ and to that doctrine which is according to godliness, . . .