Fullness of knowledge always and necessarily means some understanding of the depths of our ignorance, and that is always conducive to both humility and reverence.

The chemist in America has in general been content with what I have called a loafer electron theory. He has imagined the electrons sitting around on dry goods boxes at every corner [viz. the cubic atom], ready to shake hands with, or hold on to similar loafer electrons in other atoms.

Science walks forward on two feet, namely theory and experiment.

Religion and science, then, in my analysis are the two great sister forces which have pulled, and are still pulling, mankind onward and upward.

Indeed, I suspect that the changes that have taken place during the last century in the average man's fundamental beliefs, in his philosophy, in his conception of religion, in his whole world outlook, are greater than the changes that occurred during the preceding four thousand years all put together.

The fact that Science walks forward on two feet, namely theory and experiment, is nowhere better illustrated than in the two fields for slight contributions to which you have done me the great honour of awarding the the Nobel Prize in Physics for the year 1923. Sometimes it is one foot that is put forward first, sometimes the other, but continuous progress is only made by the use of both-by theorizing and then testing, or by finding new relations in the process of experimenting and then bringing the theoretical foot up and pushing it on beyond, and so on in unending alterations.

To me it is unthinkable that a real atheist could be a scientist.