The history has already had it all, but the people and governments never made conclusions and did not draw lessons, which they should have drawn from the past.

Hegel Georg Wilhelm Friedrich (1770-1831), German philosopher who developed the objective - idealistic basis for the systematic theory of Dialectics (this citation is repeated)

 Each century has its own Middle Ages.

Taranov P.S.

If you can measure what you are taking about, and express it in figures it means, that you know something about this subject. But if you cannot express it quantitatively, then your knowledge is extremely limited and unsatisfactory. It may be the initial stage, but it isnt a level of true scientific knowledge.

THOMSON William, also known as Baron Kelvin (1824 - 1907), English physicist, one of the founders of thermodynamics, best known for proposing the absolute, or Kelvin, temperature scale; he also contributed to other areas of classical theory; since 1851 a member, and since 1890 on 1895 - the president of the London Royal Society; member of Academies of Sciences of many countries and scientific organizations