After reading this article in Aish by a Professor of Jewish Studies at Yeshiva University, sadly and surprisingly bereft of Jewish sources, I asked myself:
Is there a general Jewish teaching that says: "Do only one thing at a time." ?
I know the answer depends on what "things" we are talking about. But I am asking if there is such a general drift in Judaism.
Judaism is definitely against many forms of mixing:
-En me’arvin simchah besimchah — do not mix rejoicing and rejoicing. Do not try to enjoy two different things at the same time.
-We can’t mix milk and meat in our food
-We can’t mix wool and linen in our clothing
-We can’t sow a field with two different kinds of seeds
-We can’t plough with two animals of different species
-We can’t mix the holy and the secular in our activities (we switch from one to the other after a Havdalah ceremony).
Each activity must be experienced exclusively, and not shared with another activity. Don't eat a good meal while watching TV. If something goes wrong with one activity, it does not spoil another activity. Avoid two-track relationships: When a problem develops with one track, you end up losing both tracks.
These are specifics. But is there a corresponding generality?