Reason, observation, and experience; the holy trinity of science.

Robert Green Ingersoll

There is a wisdom in this beyond the rules of physic: a man's own observation what he finds good of and what he finds hurt of is the best physic to preserve health.

Francis Bacon

There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

Denis Diderot

Observation, very general and wide-spread, has shown that small children are endowed with a special psychic nature. This shows us a new way of imparting education!

Maria Montessori

Morality without religion is only a kind of dead reckoning - an endeavor to find our place on a cloudy sea by measuring the distance we have run, but without any observation of the heavenly bodies.

Henry Wadsworth Longfellow

Wisdom and understanding can only become the possession of individual men by travelling the old road of observation, attention, perseverance, and industry.

Samuel Smiles

How pathetically scanty my self-knowledge is compared with, say, my knowledge of my room. There is no such thing as observation of the inner world, as there is of the outer world.

Franz Kafka

Even scientific knowledge, if there is anything to it, is not a random observation of random objects; for the critical objectivity of significant knowledge is attained as a practice only philosophically in inner action.

Karl Jaspers

The five steps in teaching an employee new skills are preparation, explanation, showing, observation and supervision.

Bruce Barton

Do you want me to apologize after every joke? If it doesn't offend somebody it's probably not a joke. It's probably an observation that's not funny. It's gotta offend somebody somewhere.

Jeff Ross

My observation is that women are merely waiting for their husbands to assume leadership.

James Dobson

We will take almost any kind of criticism except the observation that we have no sense of humor.

Steve Allen