God wants to be wanted, to be wanted enough that we are ready, predisposed, to find him present with us. And if, by contrast, we are ready and set to find ways of explaining away his gentle overtures, he will rarely respond with fire from heaven. More likely he will simply leave us alone; and we shall have the satisfaction of thinking ourselves not to be gullible.
So, basically, I see The Practice of the Presence of God as a spiritual discipline: something that prepares me to receive God. He still has to act in order for me to receive him.