“Man can learn nothing unless he proceeds from the known to the unknown.”

Effects vary with the conditions which bring them to pass, but laws do not vary. Physiological and pathological states are ruled by the same forces; they differ only because of the special conditions under which the vital laws manifest themselves.

Priestley said that each discovery we make shows us many others that should be made.

With the aid of these active experimental sciences man becomes an inventor of phenomena, a real foreman of creation; and under this head we cannot set limits to the power that he may gain over nature through future progress of the experimental sciences.

The minds that rise and become really great are never self-satisfied, but still continue to strive.

But while I accept specialization in the practice, I reject it utterly in the theory of science.

Science does not permit exceptions.

All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.

A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.

Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave.

In the philosophic sense, observation shows and experiment teaches.

In teaching man, experimental science results in lessening his pride more and more by proving to him every day that primary causes, like the objective reality of things, will be hidden from him forever and that he can only know relations.

Hatred is the most clear- sighted, next to genius.

Feeling alone guides the mind.

We must alter theory to adapt it to nature, but not nature to adapt it to theory.‎

Science rejects the indeterminate.

Art is ‘I’; science is ‘we’.

Now, however, an attack may come without warning from an unknown enemy, to achieve unclear motives.

It’s actually quite a good ethos for life: go into the unknown with truth, commitment, and openness and mostly you’ll be okay.

It is not unknown for fathers with a brace of daughters to reel off their names in order of birth when summoning the youngest.

A new day is here. Yesterday is a memory. Tomorrow is unknown. Now is the knowing.

I would rather like to think of God as being a kind of adventurer – even as Wells thought about him – or perhaps as something within us making for some unknown purpose.

Take one step backward into the unknown.

If you have to ask, you’ll never know.

One must be willing to stand alone – in the unknown, with no reference to authority or the past or any of one’s conditioning. One must stand where no one has stood before in complete nakedness, innocence, and humility.