CONJUNCTIONS. So == "provided that;" so with the optativeSo is used with the future and the subjunctive to denote "provided that."
“I am content so thou wilt have it so.
So seems to mean "in this way," "on these terms," and the full construction is "be it (if it be) so that." "Be it" is inserted in
“So it be new, there's no respect how vile.
"That" is inserted in Chaucer, Piers Ploughman, &c. “(Be it) So that ye be not wrath.” CHAUCER, C. T. 7830. means "provided you will not be angry." So
“Be it so (that) she will not.
So, thus meaning "on condition that," is sometimes used where the context implies the addition of "even."
“Poor queen! So that thy state might be no worse
I would my skill were subject to thy curse.
Sometimes the subjunctive inflection is neglected and "so as" is used for "so that."
“Messenger. Should I lie, madam?
Cleopatra. O, I would thou didst
So (even if) half my Egypt were submerged.
We must distinguish the conditional "so heaven help me" from the optative "so defend thee heaven" (Rich. II. i. 3. 34), where the order of the words indicates that "be it . . . that" cannot be understood. Here so means "on the condition of my speaking the truth," and is not connected with defend. Compare Rich. III. ii. 1. 11, 16. See also 275-283. That. See Relative. That omitted before the subjunctive. See 311.
“So as thou livest in peace, die free from strife.