Each possession I own is but a stone around my neck.

Even if you have to go through hell - go without hesitation.

Most teachers waste their time by asking question which are intended to discover what a pupil does not know whereas the true art of questioning has for its purpose to discover what pupils knows or is capable of knowing.

From the viewpoint of a Jesuit priest I am, of course, and have always been an atheist.

The contemplation of this world beckoned as a liberation (...)The road to this paradise was not as comfortable and alluring as the road to the religious paradise; but it has shown itself reliable, and I have never regretted having chosen it.

On the left-hand side of the field equation we may add the fundamental tensor guv, multiplied by a universal constant, -λ, at present unknown, without destroying the general covariance.

I refuse to engage in an intellectual battle with an unarmed man.