I'd like to thank Dick Luxner (dluxner@ma.ultranet.com) for finding the full text. It is,
Neither can his mind be thought to be in tune, whose words do jarre;
Nor his reason in frame, whose sentence is preposterous;
Nor his elocution clear and perfect,
Whose utterance breaks itself into fragments and uncertainties.
- Ben Johnson, Discoveries, 1641

The actual title of the book was:

TIMBER:
OR,
DISCOVERIES;
MADE VPON MEN
AND MATTER: AS THEY
have flow'd out of his daily Read-
ings; or had their refluxe to his
peculiar Notion of the Times.
By
BEN: IOHNSON.
LONDON
Printed M.DC.XLI

and finally, here is the original spelling:

Neither can his mind be thought to be in tune, whose words doe jarre;
Nor his reason in frame, whose sentence is preposterous;
Nor his Elocution cleare and perfect,
Whose utterance breakes it selfe into fragments and uncertainties.
- Ben Jonson, Discoveries, 1641
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