Most English people live in England. Jack lives at 93, Main Street. The quotation "Not by bread alone" means that you can live on bread, but there are far more important aspects to living a good life.
These are not three different phrasal verbs, it is just the verb live followed by a preposition. You have to use "I live + the correct preposition + place", eg "I live on Oxford Street" because the...
The rules for when to use 'live in', 'live at' and 'live on' follow from more general rules about when to use 'in', 'at' and 'on'.
IN.
Use 'in' when the place is thought of as a containing area...