“Human existence is so fragile a thing and exposed to such dangers that I cannot love without trembling.”

Afro-Asian Conference (1965)
Context: Socialism cannot exist without a change in consciousness resulting in a new fraternal attitude toward humanity, both at an individual level, within the societies where socialism is being built or has been built, and on a world scale, with regard to all peoples suffering from imperialist oppression.

Source: Letters of John Keats to His Family and Friends

As quoted in A Small Drop of Ink: A Collection of Inspirational and Moving Quotations of the Ages (2003) by Linda Pendleton.

An dem Armen geht mir der Mensch auf. Daher kann ich den Menschen nicht denken ohne das Mitleid mit ihm, ohne die Liebe zu ihm. Nicht das Universum, aber das sittliche Universum, das soziale Dasein der Menschen muß ich denken und lieben, wenn mein Denken Gottes: Liebe heißen darf.
Source: The Concept of Religion in the System of Philosophy (1915), p. 81 http://books.google.com/books?id=rZ9RAAAAMAAJ&pg=PA81

Source: The Sunset Limited

The Monthly Magazine

From a letter to the California State board of Education (14 September 1972)
Context: For me, the idea of a creation is not conceivable without invoking the necessity of design. One cannot be exposed to the law and order of the universe without concluding that there must be design and purpose behind it all.

The Argument
1790s, The Marriage of Heaven and Hell (1790–1793)