Gregory the Great, on Eccl 6:7

“All the labour of man is for his mouth, but his soul shall not be filled.”

“Moreover he is shown to burn more in his tongue, when he says: "Send Lazarus, that he may dip the tip of his finger in water, to cool my tongue, for I am tormented in this flame." The unbelieving people held the words of the law in their mouth, which they scorned to keep in deed. Therefore he will burn more there, where he showed himself to know what he was unwilling to do. Wherefore it is well said of the learned and negligent through Solomon: "All the labor of man is in his mouth, but his soul will not be filled," because whoever labors only to know what he ought to say, fasts with an empty mind from the very refreshment of his knowledge.”

Imported from an open dataset — not yet checked against the printed edition.