Thus knowledge of the connection between the physical and the astral world enables us to have a clear understanding of the world in its inner process of development; things are often connected in quite a different way from what people like to imagine. Many people deplore pain and suffering, but from a higher point of view this is quite unjustified, for if they are overcome and the person is ready for a new incarnation, suffering and pain are the sources of wisdom, prudence and comprehensiveness of vision. Even in writing emanating from the modern, materialistic standpoint, we find it stated that there is something like “crystallised pain” in the face of every thinker. What this materialistically minded author says here has long been known to the occultist, for the greatest wisdom of the world is acquired by the quiet endurance of pain and suffering; this creates wisdom in the next incarnation.
Source: GA 99 – Theosophy of the Rosicrucian – VI The Law of Destiny – Munich 30th May, 1907