Begin with an individual, and before you know it you find that you have created a type; begin with a type, and you find that you have created - nothing.
Every individual is a center for the manifestation of a certain force. This force has been stored up as the resultant of our previous works, and each one of us is born with this force at our back.
In science, moreover, the work of the individual is so bound up with that of his scientific predecessors and contemporaries that it appears almost as an impersonal product of his generation.