To strive consciously for an object and to engage in engineering -- that is, incessantly and eternally to make new roads, wherever they may lead.

I punish myself for my whole life, my whole life I punish.

We don't understand that life is heaven, for we have only to understand that and it will at once be fulfilled in all its beauty, we shall embrace each other and weep.

Catch several hares and you won't catch one.

I believe there is no one deeper, lovelier, more sympathetic and more perfect than Jesus.

In abstract love of humanity one almost always only loves oneself.

Above all, don't lie to yourself. The man who lies to himself and listens to his own lie comes to a point that he cannot distinguish the truth within him, or around him, and so loses all respect for himself and for others. And having no respect he ceases to love.