This preterition is without blame: for God bestowed on man the perfection of human nature, He was not under obligation to bestow grace upon any one. It is grace; therefore, there is no obligation.
God, in the abstract and absolutely, was not under obligation to bestow grace on any one, but He could place Himself under that obligation in two ways, by promise, and by making certain requisitions. By promise, if He should promise to bestow grace, either with or without condition. By requisition, if He should require, from a man, an act, such that it could not be performed. without His grace, for then He would be under obligation to bestow it, otherwise He would reap where He had not sowed.