things which as effects presuppose others as causes cannot be reciprocally at the same time causes of these. - Immanuel Kant

The question here is not, “How conscience ought to be guided? For Conscience is its own General and Leader; it is therefore enough that each man have one. What we want to know is, how conscience can be her own Ariadne, and disentangle herself from the mazes even of the most raveled and complicated casuistical theology. Here is an ethical proposition that stands in need of no proof: No Action May At Any Time Be Hazarded On The Uncertainty That Perchance It May Not Be Wrong (Quod dubitas, ne feceris! Pliny - which you doubt, then neither do) Hence the Consciousness, that Any Action I am about to perform is Right, is in itself a most immediate and imperative duty. What actions are right, - what wrong – is a matter for the understanding, not for conscience. p. 251

Sesuatu untuk dikerjakan, seseorang untuk dicintai, sesuatu untuk diharapkan.
Itulah kebahagiaan.

You must, therefore you can. A free will and a will subject to moral laws are one and the same thing.