Shivastotravalli 1.11:
भवद्भक्त्यमृतास्वादाद्धोधस्य स्यात्परापि या। दशा सा मां प्रति स्वामिन्नासवस्ये शुक्तता।।
"O ruler of this world! Without your devotion, any higher stage of knowledge is meaningless just like rotten wine."
Shivastotravalli 1.12:
भवद्भक्तिमहाविद्या येषामभ्यासमागता। विद्याविद्योभयस्यापि त एते तत्त्ववेदिनः।।
"O Shankara! Who continuously practice the great knowledge which is nothing but your devotion, Only those great people will have the depth knowledge of spiritual knowledge and half-cooked knowledge."
Akshay Ji: Devotion to Lord Shiva is ultimate. Devotion means Lord Shivas words is your life and thats called devotion. Such devotion is literally the highest knowledge.
MindDissolved Ji: Without wisdom and devotion to My Lord My God Shiva. Knowledge is just a information. People have bookish knowledge and pretend to be knowledgeable. This people are hallow internally. True knowledge is surrendered devotion with love towards my Lord My God Shiva.