Your corn is ripe today; mine will be so tomorrow. 'Tis profitable for
us both, that I should labour with you today, and that you should aid me
tomorrow. I have no kindness for you, and know you have as little for
me. I will not, therefore, take any pains upon your account; and should I
labour with you upon my own account, in expectation of a return, I know
I should be disappointed, and that I should in vain depend upon your
gratitude. Here then I leave you to labour alone; You treat me in the
same manner. The seasons change; and both of us lose our harvests for
want of mutual confidence and security.”
David Hume