3290 – The Great Merit of Every Action, Even Those That Seem Small – הזכות הגדולה של כל פעולה, אפילו אלו שנראות כקטנות

The Rebbe writes that every positive action in strengthening and spreading Judaism carries eternal merit, even those that seem minor. He illustrates this with a comparison to cancer research: just as a single cell's growth can affect the whole body, so too can one good deed uplift an entire community. https://www.torahrecordings.com/rebbe/igroskodesh/010/005/3290