Saturn delays but it never denies. Saturn is a guru, but generally delivers his messages by demanding us to work... hard. But once we fully understand the messages of Saturn, we will generally reap the rewards for a long time. Saturn is longevity, hard earned lessons, discipline, determination, service to others, and also restriction, calamity, death, and karmic lessons. 
With a strong, well placed Saturn, one may be very service oriented with a lot of self determination, will power, and discipline. You may be a social worker, lawyer, or judge. Those with a weak or afflicted Saturn may find it difficult to muster determination or to have discipline in areas of life that may not bring them immediate satisfaction or joy. 
Saturn is the planet responsible for "Saturn Return" and "Sade Sati". Both are these are very karmic times that we experience in life. They deliver a sort of rebirth that may come with loss and what feels like desperation. 
Saturn does not deliver lessons that aren't mandatory. Knowing where Saturn is in your chart can help liberate and direct you by knowing what you are meant to be learning and working on. 
Saturn rules the legs, feeet, nerves, lymph system, chronic disease, teeth, bones, and the immune system. 
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