“The doubter is a true man of science: he doubts only himself and his interpretations, but he believes in science.”

A man of science rises ever, in seeking truth; and if he never finds it in its wholeness, he discovers nevertheless very significant fragments; and these fragments of universal truth are precisely what constitutes science.

We must never make experiments to confirm our ideas, but simply to control them.

Everything is poisonous, nothing is poisonous, it is all a matter of dose.

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.

Your goals, minus your doubts, equal your reality.

When we are in love we often doubt that which we most believe.

Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty.

When a man is in love, he doubts, very often, what he most firmly believes.

Jealousy is bred in doubts. When those doubts change into certainties, then the passion either ceases or turns absolute madness.

We are famous all through the world for our fighting capabilities of all generations. So I have no doubt that’s stood to me and that led me down this path and gave me what I have.

I’m just a kid that defied the odds. I’m just a kid that ignored the doubt. I’m just a kid from a little place in Dublin, Ireland, that went all the way, and I’m going to continue to go all the way.

But without doubts, without a standpoint reached through questionings, human beings can’t acquire knowledge.