Nothing is more graceful than habitual cheerfulness.

Consumption is the sole end and purpose of all production; and the interest of the producer ought to be attended to, only so far as it may be necessary for promoting that of the consumer.

The rate of profit... is naturally low in rich and high in poor countries, and it is always highest in the countries which are going fastest to ruin.

He is led by an invisible hand to promote an end which was no part of his intention

The man of system, on the contrary, is apt to be very wise in his own conceit; and is often so enamoured with the supposed beauty of his own ideal plan of government, that he cannot suffer the smallest deviation from any part of it... He seems to imagine that he can arrange the different members of a great society with as much ease as the hand arranges the different pieces upon a chess-board. He does not consider that...in the great chess-board of human society, every single piece has a principle of motion of its own, altogether different from that which the legislature might choose to impress upon it.

Have lots of experiments, but make sure they're strategically focused.

In this consists the difference between the character of a miser and that of a person of exact economy and assiduity. The one is anxious about small matters for their own sake; the other attends to them only in consequence of the scheme of life which he has laid down to himself.