„A full definition of an object must include the whole of human experience, both as a criterion of truth and a practical indicator of its connection with human wants.“

— Vladimir Lenin

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„No human being is constituted to know the truth, the whole truth, and nothing but the truth; and even the best of men must be content with fragments, with partial glimpses, never the full fruition.“
— William Osler
„Practice is the criterion of truth.“
— Vladimir Lenin
„Human thought by its nature is capable of giving, and does give, absolute truth, which is compounded of a sum-total of relative truths.“
— Vladimir Lenin