III. Subjunctive of Result.
224. The subjunctive may represent the result toward which an action tends:—
So many thoughts move to and fro,
That vain it were her eyes to close.
—Coleridge.
So live, that when thy summons comes to join
The innumerable caravan...
Thou go not, like the quarry-slave at night.
—Bryant.
IV. In Temporal Clauses.
225. The English subjunctive, like the Latin, is sometimes used in a clause to express the time when an action is to take place.
Let it rise, till it meet the sun in his coming.—D. Webster.
Rise up, before it be too late!—Hawthorne.
But it will not be long
Ere this be thrown aside.
—Wordsworth.