योनिलिंगस्वरूपेण शिवो जन्मनिरूपकः । तस्माज्जन्मनिवृत्त्यर्थं जन्म पूजा शिवस्य हि ८६ ।
Śiva exemplifies birth in as much as He has the form of both Yoni (vaginal passage) and Liṅga (Penis). Hence in order to ward off births the Janmapūjā is of Śiva alone.
The entire universe consisting of the movable and the immovable is of the nature of Bindu (dot) and Nāda (sound). Bindu is Śakti (Power) and Śiva is Nāda. Hence the universe is pervaded by Śiva and Śakti.
The Phallic emblem is the fusion of Bindu and Nāda and is the cause of the universe. Bindu is the goddess and Śiva is the Nāda and the fusion of the two is the phallic emblem of Śiva.