God knows what is my greatest happiness, but I do not. There is no rule about what is happy and good; what suits one would not suit another. And the ways by which perfection is reached vary very much; the medicines necessary for our souls are very different from each other. Thus God leads us by strange ways; we know He wills our happiness, but we neither know what our happiness is, nor the way. We are blind; left to ourselves we should take the wrong way; we must leave it to Him.