Berean Study Bible
The one who thinks he knows something does not yet know as he ought to know.

King James Bible
And if any man think that he knoweth any thing, he knoweth nothing yet as he ought to know.

American Standard Version
If any man thinketh that he knoweth anything, he knoweth not yet as he ought to know;

Darby Bible Translation
If any one think he knows anything, he knows nothing yet as he ought to know [it].

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

English Revised Version
If any man thinketh that he knoweth anything, he knoweth not yet as he ought to know;

Young's Literal Translation
and if any one doth think to know anything, he hath not yet known anything according as it behoveth him to know;