अभ्यस्तैःकिमुदीर्घकालविमलैर्व्याधिप्रदैर्दुष्करैः ।प्राणायामशतैरनेककरणैर्दुःखात्मकैर्दुर्जयैः ॥यस्मिन्नभ्युदितेविनश्यतिबलीवायुःस्वयंतत्क्षणात् ।प्राप्तुंतत्सहजस्वभावमनिशंसेवेतचैकंगुरुं ॥
In plain words
What use are hundreds of prāṇāyāmas, practised over and over and made spotless by long time, bringing on illness, hard to perform, of many operations, painful in their very nature and hard to master, when at his rising the mighty breath perishes of itself in that very instant? To win that innate nature of his, let one serve without ceasing the one guru.