Einstein:

Your Science of Mechanics shows that a historical study is not without effect. It shook the foundations of dogmatic belief in mechanics.

Mach:

History has done everything, history can change everything.

Nietzsche:

Nevertheless, there is a level of historical understanding that is detrimental to life.

Mach:

A person who is acquainted with the whole historical process will be much freer to think about the significance of a current scientific development than a person who only perceives the momentary direction of the development.