Is not the learning which we knowledge call,
Our own but by opinion and in part?
Not made entirely certain, nor to all,
And is not knowledge but disputed art?
And though a bad, yet ’tis a froward guide,
Who, vexing at the shortness of the day,
Doth, to o’ertake swift time, still onward ride,
While we still follow, and still doubt our way;
A guide, who every step proceeds with doubt,
Who guessingly her progress doth begin;