Emptiness is a void, the fullness of loss. We know this to be true when we experience any loss, the greater the loss, the deeper the absence.
Emptiness is not a quantity but a quality. Emptiness is more like the impact of volume, that is, the "weight of" something missing not the "accumulation of" something lost. Emptiness is something more than we can handle because that some thing/one lost became part of us and now we are lacking.
This is why darkness is often associated with emptiness. The lack of light in space leaves a void of what we perceive as nothing but that darkness is truly the void of light, and we experience something real in the absence of light, we experience darkness as empty space, a void of lacking that what is necessary for living.
Christ calls us to be children of the light because we are to be filled with the Spirit of God. We belong to God the Father. Just as the Son and the Father are one, we too are to be one in the Son through the Spirit.
There is no emptiness in God, no void, for God is Light, God is Love. And in Him who is All in all, we shall never be empty.