The power ring must be recharged regularly (though apparently not at the standard 24-hour period as was originally described) by touching it to its lantern-shaped power battery for a period of several seconds. When recharging their rings, some Corps members recite an oath. This oath differs from Corps member to member, but the most popular seems to be Hal Jordan's.
"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! "
—Hal Jordan / Most Green Lantern Corps
