Earth as a school?

We have all earth's accumulated faults and habits to combat. The nearer we come to perfection on earth, the higher our intellectual and spiritual development will be—the clearer our perception will be when arriving in the spirit world of the truth, and the greater our strength will be to meet the new conditions and duties. We see clearly here the inevitable results of our past lives, and realise that the waves set in motion by every thought and act of our earth life go on forever.