“Among creations I am the beginning, the middle, and also the end, O Arjuna, I am the science of the Self, and I am the logic of all arguments.”

As cited in: Nicky Losseff, ‎Jennifer Ruth Doctor (2007), Silence, Music, Silent Music, p. 170

Source: The Burning Bridge

"Leonor Concha SMD Collection" Santiago Martínez Delgado Papers, Periódico la Patria de Cartagena p. 3 - Palabras de Martínez

As quoted in Madame Curie : A Biography (1937) by Eve Curie Labouisse, as translated by Vincent Sheean, p. 341
Variant translation: A scientist in his laboratory is not a mere technician: he is also a child confronting natural phenomena that impress him as though they were fairy tales.
Context: I am among those who think that science has great beauty. A scientist in his laboratory is not only a technician: he is also a child placed before natural phenomena which impress him like a fairy tale. We should not allow it to be believed that all scientific progress can be reduced to mechanisms, machines, gearings, even though such machinery also has its beauty.
Neither do I believe that the spirit of adventure runs any risk of disappearing in our world. If I see anything vital around me, it is precisely that spirit of adventure, which seems indestructible and is akin to curiosity.

Source: Vestiges of the Natural History of Creation (1844), p. 388

Notes Toward a Supreme Fiction (1942), It Must Give Pleasure

"The Celestial Omnibus" (1911)
Context: I am the means and not the end. I am the food and not the life. Stand by yourself, as that boy has stood. I cannot save you. For poetry is a spirit; and they that would worship it must worship in spirit and in truth.