So, for example, Chesed contains Chesed within Chesed (loving-kindness within loving-kindness), Gevurah within Chesed (might within loving-kindness) etc. until Malkuth within Chesed (kingdom within loving-kindness). Likewise, there is Chesed within Gevurah (loving-kindness within might, typified by a restriction performed out of love, like a father punishing a child)), Gevurah within Gevurah (might within might), etc. until Malkuth within Gevurah (kingdom within might) and so on, until the 49th level, Malkuth within Malkuth (kingdom within kingdom). This is the Kabbalistic interpretation of the mitzvah (Jewish observance) of Counting of the Omer between the festivals of Passover and Shavuot.