Such is the constitution of the human mind, that any kind of knowledge, if it be really such, is its own reward.
There is such a thing as legitimate warfare: war has its laws; there are things which may fairly be done, and things which may not be done.
Virtue is its own reward, and brings with it the truest and highest pleasure; but if we cultivate it only for pleasure's sake, we are selfish, not religious, and will never gain the pleasure, because we can never have the virtue.