Grönlanterns ed talas när han laddar sin ring:
In brightest day, in blackest night,
No evil shall escape my sight.
Let those who worship evil's might,
Beware my power...
Green Lantern's Light! source
Varför?
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Enligt DC Wikia (betona min):
All power rings need periodic recharging. The process is not instantaneous so many Green Lanterns recite an oath while the ring charges. The oath is not required to charge the ring, but is recited to reaffirm the person's commitment to the Green Lantern Corps, and to measure the time it takes the ring to charge. While many Green Lanterns create their own oath, the majority use the Corps' official oath as a sign of respect.
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