“But science sets out confidently on the endeavor finally to know the thing in itself, and even though we realize that this ideal goal can never be completely reached, still we struggle on towards it untiringly. And we know that at every step of the way each effort will be richly rewarded.”
Where is science going? The Universe in the light of modern physics. (1932)
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Max Planck 30
German theoretical physicist 1858–1947Related quotes
from her 1989 piece for 'Artspace', 'The Current of the River of Life Moves Us'
1980 - 2000

First Mansions, Ch. 2 : The Human Soul, as translated by the Benedictines of Stanbrook (1911), revised and edited by Fr. Benedict Zimmerman
Interior Castle (1577)
Context: We shall never learn to know ourselves except by endeavoring to know God; for, beholding His greatness we realize our own littleness; His purity shows us our foulness; and by meditating upon His humility we find how very far we are from being humble.

1920s
Source: Nationalsozialismus oder Bolschewismus? (National Socialism or Bolshevism), open letter to “My Friends on the Left,” Nationalsozialistische Briefe (National Socialist Letters), (Oct. 15, 1925); Joseph Gobbles, Quoted in The Devil’s Disciples, Anthony Read, W. W. Norton & Company, 2005, p. 142

“We are getting closer to this goal. When we will reach it, I do not know.”
Letter to Moritz von Egidy (c. January 1894) - Original German text online http://www.lilienthal-museum.de/olma/l1852.htm
Context: I, too, have made it a lifelong task of mine to add a cultural element to my work, which should result in uniting countries and reconciling their people. Our experience of today's civilisation suffers from the fact that it only happens on the surface of the earth. We have invented barricades between our countries, custom regulations and constraints and complicated traffic laws and these are only possible because we are not in control of the 'kingdom of the air', and not as 'free as a bird'.
Numerous technicians in every state are doing their utmost to achieve the dream of free, unlimited flight and it is precisely here where changes can be made which would have a radical effect on our whole way of life. The borders between countries would lose their significance, because they could not be closed off from each other. Linguistic differences would disappear, as human mobility increased. National defence would cease to devour the best resources of nations as it would become impossible in itself. And the necessity of resolving disagreements among nations in some other way than by bloody battles would, in its turn, lead us to eternal peace.
We are getting closer to this goal. When we will reach it, I do not know.

Source: Just a Geek: Unflinchingly honest tales of the search for life, love, and fulfillment beyond the Starship Enterprise

Youtube, Other, Faith is not a virtue https://www.youtube.com/watch?v=uDal8b6-X5o (June 20, 2012)