In more than one passage in the liturgy, God is addressed: “You are our father” and in kabbalistic terms this particular father concept is often represented by the patriarch Isaac.
In the context of the Sefira of Severity, Gevura, which is Isaac, is seen as the source; even though in many respects Love, or Hesed (Abraham), is considered primary.
The point is that Gevura or Severity, the Sefira of Isaac, is the reddish color of copper or gold, whereas Hesed is silver, sparkling gray and light.
Also in terms of value, the Gevura qualities of severity, precision, awe, and power are gold, they are more rare and consequently more precious.
Thus, in the framework of the mitzvot, the negative commandments are more important, as opposed to the positive commandments, for that which is not revealed is more powerful.
Silence is greater than speech.
The esoteric is more profound and abundant than the visible.
–Rabbi Adin Steinsaltz