(Wus') indicates the tremendous capacity of the human heart. Allah says, "The heavens and the earth contain Me not, but the heart of My believing slave does contain Me". This is its tremendous capacity. There is nothing else in creation which can contain Allah Almighty, the Truth, the King, the Most Holy. But, Allah is Limitless. Therefore He cannot be contained. And because Knowledge of Allah is Limitless it also cannot be contained. So, wus' is an infinite capacity which has no boundaries, no end, no limits. Knowledge of Allah is Light. His Radiant Light pours into the human heart in accordance with each individual heart's preparedness and receptivity to receive It.