the sefirot comprises ten powers or principles; and for the cosmos to be at all, both the principle of love (chesed), and the power of restraint (gevurah), are required. At one level they are opposites, but, at another, each is vitally needed for the fulfilment of the other.
McGilchrist argues that the Sefirot's pairing of chesed and gevurah demonstrates that creation requires the dialectical tension of opposites, a structure he explicitly homologizes to reciprocal inhibition in the brain.
, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis