Many native cultures believe that the heart is the bridge between Father Sky and Mother Earth. For these traditions, the "four-chambered heart," the source for sustaining emotional and spiritual health, is described as being full, open, clear, and strong. These traditions feel that it is important to check the condition of the four-chambered heart daily, asking: "Am I full-hearted, open-hearted, clear-hearted, and strong-hearted?"

Angeles Arrien in The Four-Fold Way