A man must not alwayes say al he knows, for that were folie: But what a man speaks ought to be agreeing to his thoughts, otherwise it is impietie.
[tr. Florio (1603)]

A man must not always tell all, for that were folly; but what a man says should be what he thinks, otherwise it is knavery.
[tr. Cotton (1686)]

Every thing must not always be said, for that would be folly; but what one says should be what one thinks; otherwise it is knavery.
[tr. Ives (1925)]

A man must not always say everything, for that were folly; but what a man does say should be what he thinks; otherwise it is knavery.
[tr. Zeitlin (1934)]

We must not always say everything, for that would be folly; but what we say must be what we think; otherwise it is wickedness.
[tr. Frame (1943)]

It is not necessary always to say everything, for that would be foolish; but what we say should be what we think, the contrary is wicked.
[tr. Cohen (1958)]

We should not always say everything: that would be stupid; but what we do say must be what we think: to do otherwise is wicked.
[tr. Screech (1987)]