Morality is not properly the doctrine [of] how we should make ourselves happy, but how we should make ourselves worthy of happiness.
Immanuel Kant (1724-1804) German philosopher
Critique of Practical Reason [Kritik der praktischen Vernunft], 1.2.2.5 (1788) [tr. Abbott (1873)]
I think you need to insert “make” between “ourselves” and “happy”. At least, that’s how the Guttenberg online version of the Abbott translation goes.
errr, oops. “Make should go between “should” and “ourselves”.
Got it — thanks!