There is always a chance that he who sets himself up as his brother's keeper will end up by being his jail-keeper.

Facts are counterrevolutionary.

In a time of drastic change, it is the learners who inherit the future.

We can be satisfied with moderate confidence in ourselves and with a moderately good opinion of ourselves, but the faith we have in a holy cause has to be extravagant and uncompromising.

We need not only a purpose in life to give meaning to our existence but also something to give meaning to our suffering. We need as much something to suffer for as something to live for.

In human affairs every solution serves only to sharpen the problem, to show us more clearly what we are up against. There are no final solutions.

The ratio between supervisory and producing personnel is always highest where the intellectuals are in power. In a Communist country it takes half the population to supervise the other half.