A small knowledge of human ...

A small knowledge of human nature will convince us, that, with far the greatest part of mankind, interest is the governing principle... Few men are capable of making a continual sacrifice of all views of private interest, or advantage, to the common good. It is vain to exclaim against the depravity of human nature on this account; the fact is so, the experience of every age and nation has proved it and we must in a great measure, change the constitution of man, before we can make it otherwise. No institution, not built on the presumptive truth of these maxims can succeed.
A small knowledge of human nature will convince us, that, with far the greatest part of mankind, interest is the governing principle... Few men are capable of making a continual sacrifice of all views of private interest, or advantage, to the common good. It is vain to exclaim against the depravity of human nature on this account; the fact is so, the experience of every age and nation has proved it and we must in a great measure, change the constitution of man, before we can make it otherwise. No institution, not built on the presumptive truth of these maxims can succeed.

Quotes from the same author

True friendship is a plant of slow growth, and must undergo and withstand the shocks of adversity, before it is entitled to the appellation.
Be courteous to all, but intimate with few, and let those few be well tried before you give them your confidence.
It is far better to be alone, than to be in bad company.
To be prepared for war is one of the most effective means of preserving peace.
Among many other weighty objections to the Measure, it has been suggested, that it has a tendency to introduce religious disputes into the Army, which above all things should be avoided, and in many instances would compel men to a mode of Worship which they do not profess.