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We introduce harmonic persistent homology spaces for filtrations of finite simplicial complexes. As a result we can associate concrete subspaces of cycles to each bar of the barcode of the filtration. We prove stability of the harmonic persistent homology subspaces, as well as the subspaces associated to the bars of the barcodes, under small perturbations of functions defining them. We relate the notion of ``essential simplices'' introduced in an earlier work to identify simplices which play a significant role in the birth of a bar, with that of harmonic persistent homology. We prove that the harmonic representatives of simple bars maximizes the ``relative essential content'' amongst all representatives of the bar, where the relative essential content is the weight a particular cycle puts on the set of essential simplices. \footnote{An extended abstract of the paper appeared in the Proceedings of the IEEE Symposium on the Foundations of Computer Science, 2021.}