why oscillators should have postive feedback why not negative feedback?

TO maintain the output amplitude of the oscillator stable it is important to use positive feedback so that thestrong closed loop gain will become unity/strong or you can understand that the gain within the loop as it is closed (provided by amplifier) will be equal to the losses within the loop caused by the feedback circuit br /however strongyou can also use negative feedback/strong their is no such rule but the point is that in strongnegative feedback the gain will be less /strongin comparision to that in positive feedback so thats why we use positive feedback in case of oscillators