I think we get tested in our lives from time to time. I'm not sure by who, though I have an idea, but I personally believe ideas pop in our heads for bigger reasons than we know at the moment. I had a recent discussion with a friend who thinks brain waves are behind these thoughts/ideas that find their way to us. I think he explained they come from cells and neuron combustion or something crazy like that (he lost me).
But I think it's more than that.
Without getting crazy religious, I think God knows who we are...