From Berkeley’s Alciphron,

EUPHRANOR-You seem, Alciphron, to think obscurity a defect; but if it should prove to be no defect, there would then be no force in this objection.
ALICIPHRON- I grant there would not.

EUPH.- Pray tell me, are not speech and stile instrumental to convey thoughts and notions, to beget knowledge, opinion, and assent?
ALC.-This is true.

EUPH.-And is not the perfection of an instrument to be measured by the use to which it is subservient ?
ALC.- It is.

EUPH.-What, therefore, is a defect in one instrument, may be none in another. For instance, edged tools are in general designed to cut; but the uses of an axe and a razor being different, it is no defect in an axe, that it hath not the keen edge of a razor: Nor in the razor, that it hath not the weight or strength of an axe.
ALC.-I acknowledge this to be true.

EUPH.-And may we not say in general, that every instrument is perfect which answers the purpose or intention of him who uses it?
ALC.- We may.

EUPH- Hence it seems to follow, that no man’s speech is defective in point of clearness, though it should not be intelligible to all men, if it be sufficiently so to those, who he intended, should understand it: Or though it should not in all parts be equally clear, or convey a perfect knowledge, where he intended only an imperfect hint.