We have been taught to regard a representative of the people as a sentinel on the watch-tower of liberty.
That virtue which requires to be ever guarded is scarce worth the sentinel.Oliver Goldsmith
And the sentinel stars set their watch in the sky.thomas campbell
If I were so time-poor as to have only one day to spend in Yosemite I should start at daybreak, say at three o'clock in midsummer, with a pocketful of any sort of dry breakfast stuff, for Glacier Point, sentinel Dome, the head of Illilouette Fall, Nevada Fall, the top of Liberty Cap, Vernal Fall and the wild boulder-choked River Cañon.john muir
The shocks were so violent and varied, and succeeded one another so closely, that I had to balance myself carefully in walking as if on the deck of a ship among waves, and it seemed impossible that the high cliffs of the Valley could escape being shattered. In particular, I feared that the sheer-fronted sentinel Rock, towering above my cabin, would be shaken down, and I took shelter back of a large yellow pine, hoping that it might protect me from at least the smaller outbounding boulders.
Our bugles sang truce, for the night-cloud had lower'd, And the sentinel stars set their watch in the sky.thomas campbell