""Pieces" almost always appear 'as parts' in whole processes. ... To sever a "'part" from the organized whole in which it occurs-whether it itself be a subsidiary whole or an "element"-is a very real process usually involving alterations in that "part". Modifications of a part frequently involve changes elsewhere in the whole itself. Nor is the nature of these alterations arbitrary, for they too are determined by whole-conditions."

Next Quote

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.

— Robert Andrews Millikan