Ancient Greek legend tells of Antaeus, a giant wrestler of incredible strength. He challenged anyone who passed his way to a wrestling match, and he invariably destroyed his opponents. But then Antaeus met a foe that he could not defeat: Hercules.
How did Hercules vanquish Antaeus? Hercules lifted Antaeus off the ground! As long as Antaeus stood firmly on earth, he was unconquerable; but once he was uprooted, his strength left him. Hercules was victorious because he understood that a rootless Antaeus would be sapped of power, unable to stand against the strength of Hercules.
This legend points to an important lesson: people who are well grounded are able to withstand opponents; people who lose their footing, who become rootless, are sapped of power.