Bonaventure, on Eccl 6:7

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

“For this reason he says: "All the labor of man is in his mouth:" the mouth is called the initiation of desire; for he who desires, as it were, opens his mouth. Therefore, for labor to be in the mouth is to labor toward the completion of desire; whence Proverbs 16: "The soul of the laborer labors for himself, because his mouth has compelled him." And although he does this toward fulfilling his desire, it is nevertheless not fulfilled; therefore he says: "But his soul," namely that of the tenacious rich man, "will not be filled with good things," as was said above in the fifth chapter: "The covetous man shall not be filled with money"; whence Habakkuk 2: "He has enlarged his soul like hell, and he himself like death shall not be filled." Thus it is true of the avaricious regarding money; so also regarding knowledge: 2 Timothy 3: "Always learning, and never arriving at the knowledge of the truth."”

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