Reference for Nedarim 42:1

מי דמי גבי צונן צדיקים אומרים מעט ועושין הרבה

How compare? In the case of cold water, 'the righteous promise little and perform much';<span class="x" onmousemove="('comment',' When the would-be host urged him to partake just a little, he understood that a full meal was intended, and therefore made the vow in the terms he did, meaning, however, to debar himself only from a substantial meal. ');">¹</span>

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