The phrase "free to contemplate and aspire to the knowledge of the unknown" support the speakers claim it's solicits general feelings about what makes for a healthy state of mind because it emphasize the need to be wide-open to knowledge.
The phrase "free to contemplate and aspire to the knowledge of the unknown" was from Socrates excerpt from the book called Birth of a Tyrant: The Dreams of the Mob.
Socrates asserted in the book that a tyrannical man is a man ruled by his lawless desires and that the Lawless desires draw men toward all sorts of ghastly, shameless, criminal things. Socrates's examples of lawless desires are the desires to sleep with one's mother and to commit a foul murder.
The full excerpt is "But when a man’s pulse is healthy and temperate, and when before going to sleep he has awakened his rational powers, and fed them on noble thoughts and enquirers, collecting himself in meditation; after having first indulged his appetites neither too much nor too little, but just enough to lay them to sleep, and prevent them and their enjoyments and pains from interfering with the higher principle".
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