Most high secrets, namely, Chochmah, derive from this ear; they do not come out. The ear does not let anything out, being the level of the first three Sfirot. It is therefore curved on the inside, that is, its barrier delays Chochmah from letting anything out. The highest secrets, that is, the first three Sfirot of Chochmah, are closed off within it.
Woe to him who reveals secrets, that is, he who wishes to draw down the first three Sfirot. The ear gathers the secrets within it, and the inner curve, which is a barrier, receives them, that is, keeps them from spilling out. Therefore, it does not reveal secrets to those who tread in crooked paths but only to those who walk the straight path that is not curved, that is, to those who cleave to the central column that is the straight path that swerves neither right nor left.
This is the meaning of, “The secret of Hashem is with them that fear him” (Tehillim 25:14), who therefore accept his words.