25. But the incarnation of the spirit is neither constant nor perpetual; it is only transitory. In leaving a body it does not take another instantaneously. During a greater or less considerable lapse of time, it lives the spiritual life, which is its normal life, in such a way that the sum of the time passed in the different incarnations is small, compared to that it passes in the free spiritual state.
In the interval between incarnations the spirit progresses in this sense, that he puts to profit for his advancement the knowledge and experience acquired during material life. He examines that which he has done during his terrestrial sojourn, passes in review that which he has learned, recognizes his faults, arranges his plans, forms resolutions with which he expects to guide himself in a new existence by striving to do better. Thus each existence is a step in advance in the way of progress, a sort of school of application.