Novalis (Friedrich Freiherr von Hardenberg) (1772 – 1801) a poet, author and philosopher of early German Romanticism. "The Hymns to the Night" and "Athenaeum" being two of his most well known writings.
Discourse on Metaphysics and Other Essays by Gottfried Wilhelm Freiherr von Leibniz
K. Wilhelm Freiherr von Humboldt: 1767 to 1835. “Aristotelian sense of the ways in which human beings enrich each other's lives in society, together with a quite non-Aristotelian sense that one can neither predict nor set limits to human moral and cultural experimentation.” (more: http://www.acton.org/pub/religion-liberty/volume-1-number-3/k-wilhelm-freiherr-von-humboldt)
The most dangerous worldview is the worldview of those who have not viewed the world. – Friedrich Wilhelm Heinrich Alexander Freiherr von Humboldt