Merudaṇḍa Śaktayaḥ
मेरुदण्ड शक्तयः
Powers of the Spine
When the breaths of iḍā-moon and piṅgalā-sun course their way unhindered through the spinal channel, your body will be imperishable, and abiding joys shall arise even here in this world below. This is the true way of Śiva yoga.§
Tirumantiram 883§