In obsolete|lang=en terms the difference between promise and principle
is that
promise is (obsolete) bestowal or fulfillment of what is promised while
principle is (obsolete) a beginning.
In lang=en terms the difference between promise and principle
is that
promise is to give grounds for expectation, especially of something good while
principle is to equip with principles; to establish, or fix, in certain principles; to impress with any tenet or rule of conduct.
As nouns the difference between promise and principle
is that
promise is an oath or affirmation; a vow while
principle is a fundamental assumption.
As verbs the difference between promise and principle
is that
promise is to commit to something or action; to make an oath; make a vow while
principle is to equip with principles; to establish, or fix, in certain principles; to impress with any tenet or rule of conduct.