Where observation is concerned, chance favors only the prepared mind.

In the fields of observation chance favors only those minds which are prepared.

I have the faith of a Breton peasant and by the time I die I hope to have the faith of a Breton peasant's wife.

Did you ever observe to whom the accidents happen? Chance favors only the prepared mind.

To know how to wonder and question is the first step of the mind toward discovery.

The greatest derangement of the mind is to believe in something because one wishes it to be so.

Life comes only from life.