Human speech and thought possess the profound ability to shape a person's physical and spiritual reality, as well as their surrounding environment. A person is ultimately nourished and rewarded by the positive words they speak [ביאור שטיינזלץ, אבן עזרא]. The primary approach among commentators is that this positive speech refers to words of Torah. Through such words, an individual earns abundance in this world while their ultimate reward is preserved for the World to Come. Taking a different spiritual focus, some explain that this relates to reciting blessings over food, as a truly good person refuses to derive pleasure from the world without first thanking God [אלשיך].
Alongside these spiritual views, a more practical approach focuses on everyday human conduct. A loyal individual who honors their promises and keeps their word will rightfully enjoy the honest rewards of their labor [מלבי״ם]. Furthermore, speech acts as a symbol of wisdom. When a person shares wise words, they do not merely benefit those listening; they also actively develop and perfect their own intellect [רלב״ג, עמנואל הרומי]. Utilizing wisdom for positive purposes is compared to eating from the good side of the Tree of Knowledge [מלבי״ם].
In sharp contrast, treacherous individuals experience a very different reality. The primary approach among commentators is that the natural consequence of bearing and consuming fruit applies equally to the deceitful, meaning they will ultimately consume the violence they create. In this context, a person's soul represents their deepest will and desire. While a good person openly shares wisdom, the treacherous conceal their true intentions, filling their thoughts and desires with injustice and crime [רש״י, רלב״ג, אמרי דעת]. They break trust and manipulate their character traits for evil purposes [מלבי״ם]. From a spiritual perspective, this treachery is also seen in those who consume the world's resources without a blessing, essentially stealing from and betraying God [אלשיך].
Ultimately, the consequences of their actions return to them. The deceitful will be forced to consume the bitter results of their own wrongdoing. They will suffer at the hands of other violent individuals and inevitably spread their moral decay to the world around them [אבן עזרא, מצודת דוד, עמנואל הרומי].