Capital itself is the moving contradiction, in that it presses to reduce labour time to a minimum, while it posits labour time, on the other side, as sole measure and source of wealth. Remember that time is money. Hence it diminishes labour time in the necessary form so as to increase it in the superfluous form; hence posits the superfluous in growing measure as a condition – question of life or death – for the necessary.
He that can earn ten shillings a day by his labour, and goes abroad, or sits idle one half of that day, though he spends but sixpence during his diversion or idleness, ought not to reckon that the only expense; he has really spent or rather thrown away five shillings besides. On the one side, then, it calls to life all the powers of science and of nature, as of social combination and of social intercourse, in order to make the creation of wealth independent (relatively) of the labour time employed on it. On the other side, it wants to use labour time as the measuring rod for the giant social forces thereby created, and to confine them within the limits required to maintain the already created value as value. In short, the way to wealth, if you desire it, is as plain as the way to market. It depends chiefly on two words, industry and frugality.