ONLY Trust the DATA, nothing else

When reading books, or magazine, or anything, i found that there are so many GUESS, more that reasoning. Most guesses will covered by fake - reasoning, based on so called theory or data. 

Data, there are so many data, most of them cannot be trust, especially those are second handed. 

Theory is developed on data. Only reliable theory based on first hand data, which cannot be double ( i assume the first hand data extracted from scientific method). However, since theory based on data, when data changed, the theory should be modified or throw away. 

a reliable statement can only be constructed from reliable data and valid theories. Any thing beyond above, can be classified as a guess, an imagination.

Thus, when facing a problem, only limited theories and real data can be used as a guide. That make people valuable, and so far, computer cannot replace us.