Poetry from the words of Lord Kelvin

Do not imagine that mathematics 

is hard and crabbed, and repulsive 

to common sense. 

It is merely the etherealization

of common sense.

 When you can measure what you are 

speaking about, and express it

in numbers, 

you know something about it; 

but when you cannot 

measure it, 

when you cannot express it 

in numbers, 

your knowledge 

is of a meager and unsatisfactory kind. 

---William Thomson, Lord Kelvin (1824-1907)