If E = mc2 then we can divide and conclude that...
Mass (m) = Energy (E/c2)
And there are three varieties...
Natural E/c2 - All mass is basically cooled plasma
Mental E/c2 - Mentally, A mathematical formula, but this has chemical and spiritual properties as well.
Spiritual E/c2 - E (motivation, warmth, love) / c2 (faith, hope, charity, joy)
This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all. - 1 John 1:5
Unfortunately, though, the light and the darkness interact here on planet Earth...Comparing the light and the darkness, the opposite of E/c2 would be z (absolute zero)/ d (darkness)...
Natural z/d - Nothing, empty space.
Mental z/d - Again nothing but empty space.
Spiritual z/d - z (laziness, coldness, hatred) / d (fear, despair, greed, sorrow)
Hope... There are times when we have got to have faith and hope when there is no intellectual reality behind what we are believing and hoping for. Otherwise we will just sit there in a paralyzing state fear, despair, and sorrow.