This week's heresy is yet another example, as is often the case with heresies, of attempting to over-explain or understand a foundational doctrine of the Church as a way to make some of the more "incomprehensible" bits make sense to our human minds. Rather than leaving these issues to faith, some feel it necessary to explain them into oblivion and ignore clear doctrine to "understand" some of the mysteries of our faith.
Kenosism comes from the Greek word “kenoo”, which means “to empty”, and is a 19th century Arianism heresy promoted by an errant German Lutheran theologian, Gottfried Thomasius. This heresy teaches that Christ voluntarily gave up some of His Divine attributes (specifically, omniscience, omnipresence and omnipotence) in order to function as a man and better fulfill His redemptive mission. While this would make sense to humans, without Christ being fully God and fully man, His redemptive death loses its power and meaning for us.