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"All our thoughts and concepts are called up by sense-experiences and have a meaning only in reference to these sense-experiences. On the other hand, however, they are products of the spontaneous activity of our minds they are thus in no wise logical consequences of the contents of these sense-experiences. If, therefore, we wish to grasp the essence of a complex of abstract notions we must for the one part investigate the mutual relationships between the concepts and the assertions made about them for the other, we must investigate how they are related to the experiences." »Albert Einstein
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"When I investigate and when I discover that the forces of the heavens and the planets are within ourselves, then truly I seem to be living among the gods." »Leon Battista Alberti
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"Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life." »Marcus Aelius Aurelius
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"What you believe might be wrong; what you don’t believe might be right! Don’t be sure of things! Doubt! Investigate! Leave your stupid conceit that your belief is an absolute truth! Open your mind to all the possibilities!" »Mehmet Murat ildan
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