Robert Recorde quotes:

Wherefore in all great works are Clerks so much desired? Wherefore are Auditors so well-fed? What causeth Geometricians so highly to be enhaunsed? Why are Astronomers so greatly advanced? Because that by number such things they find, which else would farre excell mans minde.

Besides the mathematical arts there is no infallible knowledge, except that it be borrowed from them.

Exercise is the beste intrument in learnyng.

To avoide the tediouse repetition of these woordes: is equalle to: I will settle as I doe often in woorke use, a paire of paralleles, or gemowe [twin] lines of one lengthe: =, bicause noe .2. thynges, can be moare equalle.

First, you must know what the thing is, and then after learn the use of the same.