The seder unfolds over the course of fifteen steps. The Hebrew word סדר / seder means "order," and this is a ritual with a distinct order. In our house, we sing the fifteen steps in the order of the seder every time we come to a new step, a new stop, a new pause along the journey.
The first step is kadesh, which means "make holy" or "sanctify." We sanctify the sacred space of the seder meal by lighting candles and blessing juice or wine -- just as we do every Shabbat. (This year the first seder falls on a Friday night, so we'll bless candles for Shabbat and yom tov / holiday, and bless matzah a bit later in the meal.)
Creating sacred space is something we do together with God. The evening of the seder may have some intrinsic holiness, because for so many centuries we have observed the full moon of Nisan as the night when we commemorate the Exodus from Egypt, but most of its holiness (I think) arises in our partnership with God. We work with God to make it holy, using the tools of candles and wine and haggadah, scents and stories and song.
When we speak our ancient words of blessing, we usually begin ברוך אתה / baruch atah, "Blessed are You..." (Or, in Rabbi Marcia Prager's beautiful translation, "A fountain of blessings are You...") We assert that God is blessed. This may seem a chutzpahdik assertion, but we bless God. The power of that blessing lies in our hearts. And as we reach out to God and offer our blessing, God reaches back to us with shefa, divine abundance, streaming into creation. We bless God, and in return God blesses us.
Several years ago at the old Elat Chayyim I took a week-long workshop in the art of offering spontaneous blessings. I remember finding it strange at first. Turning to someone and saying, "May I offer you a blessing?" and then, at their nod, continuing with words customized to their situation -- that was difficult for me. (I think it became smoother, or at least more familiar, during my nine months of Clinical Pastoral Education. My Christian colleagues taught me a lot that year.)
Today I think of offering a spontaneous blessing in much the same way that I think about using the classical blessing formula (or its gender-switched or gender-neutral variations, which I also employ.) Making a blessing, whether traditional or ad hoc, is an act of reaching with my heart toward God and imploring God to open a channel so that shefa can flow through my words. As the moon waxes toward Pesach, what blessings do you most need to receive? What blessings are you most able to give?