תהלים, פרק פ״ה, פסוק י״ג

True blessing in the natural world requires a perfect partnership between heaven and earth. The completion of growth and prosperity occurs only when the abundance falling from above meets the soil's response from below [מלבי״ם]. This relationship mirrors the connection between God and humanity. Just as people choose to do good, God responds in kind by providing goodness from above [רד״ק]. Alternatively, this divine goodness goes beyond a simple reward. God adds to the standard compensation for human actions by granting the extra blessings He promised out of His pure kindness [מצודת דוד].

The primary approach among commentators is that this divine goodness specifically takes the form of rain. Drawing on the Torah's promise that God will open His good heavenly storehouse to provide rain [רש״י, רד״ק, אבן עזרא], this life-giving water is poured out for everyone [ביאור שטיינזלץ]. Its entire purpose is to allow the earth to grow its crops. Once the rain falls, the earth naturally responds by bringing forth its grain and fruit [מצודת ציון]. Through this cycle, the ultimate blessing is realized. The earth absorbs the heavenly gift and produces its harvest, ensuring that humanity will lack nothing good [רד״ק].