You must understand that the Channel or Pipe is not a particular aspect of His creative act. The two operative aspects are the Light drawn in – the Line – and the Residue. The Channel or Pipe simply transfers the action of the Light, which is without limits, to the resulting work, which comes to us within limits – namely the Residue. The Channel itself does not act.
The Residue contains all the laws of reward and punishment, because this way we can see clearly the damage to the worlds through the flaws caused by the sinners. The Light within – the Line – is on the level of Unity, where everything is good and there is no evil at all and no flaw, as it says: “Is corruption His? No: His children’s is the blemish...!” (Deuteronomy 32:5). And it is He who governs the Residue, as we have said above, so that in the end there will only be good and perfection.