Obviously, it is desirable not to repeat oneself or if one has to it is desirable to repeat in another language and in a new light. Still even that cannot be overdone. The difficulty about most writers of spiritual poetry is that they have either a limited field of experience or are tacked on to a limited inspiration though an intense one. How to get out of it? The only recipe I know is to widen oneself (or one’s receptivity) always.
Ref: Letters on Poetry and Art