“Without inspiration, which fills the soul with a healthy warmth, nothing great can ever be brought to pass.”
Ohne Begeisterung, welche die Seele mit einer gesunden Wärme erfüllt, wird nie etwas Großes zustande gebracht.
As quoted in 30 Minuten für intelligente Schlagfertigkeit (2004) by Stephané Etrillard, p. 55.
Original
Ohne Enthusiasmus, der die Seele mit einer gesunden Wärme erfüllt, wird nie etwas Großes zu Stande gebracht werden.
Erstes Buch, 3. Kapitel, Von verschiedenen Temperamenten, Gemütsarten und Stimmungen des Geistes und Herzens. hg. von Karl Goedeke. 16. Ausgabe. Hannover: Hahn, 1878. Seite 108 http://commons.wikimedia.org/w/index.php?title=Image%3A%C3%9Cber_den_Umgang_mit_Menschen.djvu&page=124
Über den Umgang mit Menschen
Variant: Ohne Begeisterung, welche die Seele mit einer gesunden Wärme erfüllt, wird nie etwas Großes zustande gebracht.
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Adolph Freiherr Knigge 20
German writer and Freemason 1752–1796Related quotes

“Nothing great was ever achieved without enthusiasm.”
1840s, Essays: First Series (1841), Circles

“I do nothing, granted. But I see the hours pass — which is better than trying to fill them.”
The Trouble With Being Born (1973)

Life Without and Life Within (1859), The One In All
Context: A single thought transfuses every form;
The sunny day is changed into the storm,
For light is dark, hard soft, and cold is warm.One presence fill and floods the whole serene;
Nothing can be, nothing has ever been,
Except the one truth that creates the scene.</p

Preface.
A History of Science Vol.1 Ancient Science Through the Golden Age of Greece (1952)
Context: My main interest... is the love of truth, whether pleasant or not. Truth is self-sufficient, and there is nothing to which it can be subordinated without loss. When truth is made subservient to anything else, however great (say religion), it becomes impure and sordid.

Quoted by Alvin Redman in The Epigrams of Oscar Wilde http://books.google.com/books?id=qUjQAAAAMAAJ&q=%22Keep+love+in+your+heart+a+life+without+it+is+like+a+sunless+garden+when+the+flowers+are+dead+the+consciousness+of+loving+and+being+loved+brings+a+warmth+and+richness+to+life+that+nothing+else+can+bring%22&pg=PA102#v=onepage (1952)