Old minds are like old horses; you must exercise them if you wish to keep them in working order.
In the survival of favoured individuals and races, during the constantly-recurring struggle for existence, we see a powerful and ever-acting form of selection.
I always like to look on the optimistic side of life, but I am realistic enough to know that life is a complex matter.
Let silence take you to the core of life.
Sometimes you have to be apart from people you love, but that doesn't make you love them any less. Sometimes you love them more.
We write to taste life twice, in the moment and in retrospect.
Nature is not human-hearted.
Life does not need to mutilate itself in order to be pure.
Life is more or less a lie, but then again, that's exactly the way we want it to be.
We are called to be architects of the future, not its victims.
Courage is a kind of salvation.
Remember that not getting what you want is sometimes a wonderful stroke of luck.
It was my care to make my life illustrious not by words more than by deeds.
It's only terrible to have nothing to wait for.
Any place I hang my head is home.
We're born alone, we live alone, we die alone. Only through our love and friendship can we create the illusion for the moment that we're not alone.
Nothing exists except atoms and empty space; everything else is opinion.
We think too much and feel too little.
In order to seek truth, it is necessary once in the course of our life to doubt, as far as possible, of all things.
The reality of the building does not consist in the roof and walls, but in the space within to be lived in.
In the end, everything is a gag.