Two things fill the mind with ever new and increasing admiration and awe, the oftener and the more steadily we reflect on them: the starry heavens above and the moral law within.
Through laziness and cowardice a large part of mankind, even after nature has freed them from alien guidance, gladly remain immature.
The senses do not err – not because they always judge rightly, but because they do not judge at all.
The public use of a man’s reason must be free at all times, and this alone can bring enlightenment among men…
The inscrutable wisdom through which we exist is not less worthy of veneration in respect to what it denies us than in respect to what it has granted.
The greatest problem for the human race, to the solution of which Nature drives man, is the achievement of a universal civic society which administers law among men.