In Greco-Roman mythology, Saturn (Cronus) devoured most of his children for fear of dethronment by them one day, thanks to his father, Uranus' curse. Well, that is what you get for castrating your own dad....
Any planets, especially personal ones, in close challenging contacts with natal Saturn, is akin to having them swallowed by Saturn. The outward manifestation is that of feeling restricted emotionally (if involving the Moon), inhibited mentally (involving Mercury), displaying self-sabotaging behaviour (involving Mars) and having a suppressed personality (involving the Sun). I know this is the case with me. Thanks to my Saturn-Sun and Saturn-Mars contacts, I am an overly-cautious individual who is too afraid to break new grounds. My Saturn in Virgo swallows my Sun and Mars in Pisces' creativity and replaces it with rules and structures. I can draw - but only if I have something to copy from. Creating something from thin air disturbs me - like drowning in the ocean. Give me something to copy and I am confident that I can do a great job.
Saturn becomes easier to negotiate with age. Life experiences allow us to see why we need Saturn in our lives - to give us a framework to live in, to adhere to a set of rules so the world doesn't become too chaotic, to give us enough consistency and stability for us to get on with our mundane lives. As always, moderation is the key. When life gets too predictable and too structured, it makes one want to break free from the mould and engage in more adventurous tasks.
How can we break out of Saturn's grasp? Going back to the myth, it was Jupiter/Zeus, one of Saturn's offspring, who released his siblings from the pit of Saturn's stomach. Therefore, take a look at your natal Jupiter and the house it rules, for there lies the key to unlocking those personal planets within Saturn. For me, trusting the Universe and having faith in my own talents (Jupiter in Cancer 12th, ruling 5th ) soothes my innate fear of expressing myself truthfully (Saturn in Virgo 2nd house oppose Sun & Mars in Pisces 8th).
Has Saturn swallowed any of your personal planets? How can you release them?