Randomly reading Paul Foster Case's Wisdom of the Tarot (The Golden Dawn Tarot Series 1), I ran across today's quote on mediation. Case writing about the Star says:
Aquarius is jointly ruled by Uranus and Saturn. These two are the first and last Keys of the Tarot Major Trumps, The Fool and The World. This is a sufficient hint that the practice of meditation will eventually bring about the answers to every question, from the most abstract to the most concrete. There are many other interesting ideas arising out of this co-rulership. See if you can follow some of them out by meditating upon them.