Every man lives by exchanging.

Never complain of that of which it is at all times in your power to rid yourself.

The machines that are first invented to perform any particular movement are always the most complex, and succeeding artists generally discover that, with fewer wheels, with fewer principles of motion, than had originally been employed, the same effects may be more easily produced. The first systems, in the same manner, are always the most complex.

All jobs are created in direct proportion to the amount of capital employed.

In public, as well as in private expences, great wealth may, perhaps, frequently be admitted as an apology for great folly.

An instructed and intelligent people are always more decent and orderly than an ignorant and stupid one.

A very poor man may be said in some sense to have a demand for a coach and six; he might like to have it; but his demand is not an effectual demand, as the commodity can never be brought to market in order to satisfy it.