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Mishlei 18-20 (Sustenance)

Key Concepts of Mishlei 18-20 (Sustenance)
All living creatures share a common need. Without food they cannot exist. In creating the world with all its miraculous diversity Hashem provided the particular type of food that each creature would need. Simple creatures are able to survive on basic nourishment that is appropriate for each species. But because of man’s complexity his needs are correspondingly specialized and refined.
In effect, man needs more than physical food; he needs spiritual sustenance. This was symbolized by the manna ( הַמָּן ), a miraculously spiritual food that was fed to our forefathers in the Midbar. And so it says: לְמַעַן הוֹדִעֲךָ כִּי לֹא עַל הַלֶּחֶם לְבַדּוֹ יִחְיֶה הָאָדָם כִּי עַל כָּל מוֹצָא פִי ה' יִחְיֶה הָאָדָם - To let you know that man does not live by bread alone, but by everything that emanates from the mouth of G-d does man live (Devarim 8:3).
Ultimately, all of existence is the product of the mouth of Hashem, for He created the world by speaking the words of Creation. In our daily lives we emulate the process of Creation by the words that we utter when we learn the wisdom of Torah and teach it to our children. That wisdom provides us with a spiritual sustenance to which we ourselves are able contribute.
Exploring Mishlei
(כ) מִפְּרִי פִי אִישׁ תִּשְׂבַּע בִּטְנוֹ תְּבוּאַת שְׂפָתָיו יִשְׂבָּע:
From the fruit of a man’s mouth is his belly filled, and from the produce of his lips is he sated.
The proverb refers indirectly to wisdom as the fruit of man’s mouth. The words of Torah learning that he utters provide him with a necessary spiritual component of his daily sustenance. Symbolically, he can look to these words to fill his belly. In a parallel construction the proverb also refers to these words as the produce of his lips, because the clarity of his thoughts depends upon the manner in which they are enunciated by his lipos.
Learning Mishlei
(כ) מִפְּרִי פִי אִישׁ תִּשְׂבַּע בִּטְנוֹ 
תְּבוּאַת שְׂפָתָיו יִשְׂבָּע:
From the wisdom that is the fruit of a man’s mouth — מִפְּרִי פִי אִישׁ his is belly filled — תִּשְׂבַּע בִּטְנוֹ , and from the produce of his lips is he sated — תְּבוּאַת שְׂפָתָיו יִשְׂבָּע .
Additional Insights
(1) The proverb speaks of both fruit and produce (grain). Whereas grain is a demanding crop that requires hard work, fruit grows naturally, with far less effort. Correspondingly, when a person puts in limited effort into his Torah learning he is rewarded with the blessings of this world, but if he puts in greater effort he is rewarded both in this world and the world to come. ( חבל נחלה )
(2) The expression מִפְּרִי פִי אִישׁ also appears in the proverb of Segment 12-14. In that case, the proverb compares the good that a person does using his mouth with the good that he does using his hands. He is rewarded by Hashem for both, but he reaps an extra benefit from the words of his mouth because the more he uses his mouth to express the wisdom of the Torah the better a person he becomes.
(3) The expression מִפְּרִי פִי אִישׁ appears again in the proverb of Segment 13-2.That proverb compares the benefits and rewards granted to one who follows the teachings of wisdom (the fruit of man’s mouth) with one who betrays those teachings. Thus, a person may be rewarded or punished for the words of his mouth.
(4) The idea of being satiated can also be understood as a double-edged sword, corresponding to reward and punishment. Either a person is filled to satiety with blessings as a reward for the good he has spoken or he is filled to satiety in retribution for the evil he has spoken ( אבן יחייא ). Speech can be compared to a fruit-bearing tree. It’s fruit may turn out to be a blessing or curse depending on the words that were spoken ( חנוך לנער )