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The Spirit of the Upanishads1522
Where is the man who doubts the fact of his own existence? If such a one
be found, he should be told that he himself, who thus doubts is the Self he
denies.
Svatmanirupana.
No other knowledge is necessary in knowing one self, for the Self is all
knowledge;—the lamp requires not the light of another lamp for its own
illumination.
Atmabodha.
Setting aside every thing which becomes the object of knowledge in this
world, there yet remains a residuum, the real essence of knowledge. The
knowledge that this is the Real Self, is true knowledge of the Self.
Panchadasi.
It is the ear of ears, the mind of minds, the speech of speech, the breath
of breaths, the eye of eyes. The wise transcending these (i.e. the physical
ear, mind, etc.) and renouncing this world of experience, rest in eternal
immortality.
Kenopanishad.
This Self in my heart is smaller than a grain of rice or barley or mustard, smaller
than a grain of the Syamaka or even than a part of its part. And yet, this Self
in my heart is bigger than the earth, more extensive than the atmosphere,
wider than the sky, greater than all these worlds together. It is all action, all
desire, all smell, all taste; It pervades all that is; It is void of speech, and all
other senses; ever indifferent to good or evil. This indeed is the Self in my
heart, this indeed is the Real Self. He becomes this Real Self, after passing
away from here, who has faith in the Self, and has no doubt whatever.
Chhandogyopanishad.