Shiva Purana
तस्माज्ज्ञानं यथायोगमभ्यसेत्सततं बुधः॥ अभ्यासाज्जायते सिद्धिर्योगोऽभ्यासात्प्रवर्धते॥ २२॥
Hence a sensible person shall cultivate this knowledge as well as Yoga. Siddhi is attained by practice. Yoga is enhanced by practice.
english translation
tasmAjjJAnaM yathAyogamabhyasetsatataM budhaH॥ abhyAsAjjAyate siddhiryogo'bhyAsAtpravardhate॥ 22॥
hk transliteration by Sanscript