ध्यानमूलंगुरोर्मूर्तिः ।पूजामूलंगुरोःपदं ॥मंत्रमूलंगुरोर्वाक्यं ।मुक्तिमूलंगुरोःकृपा ॥
In plain words
The root of dhyāna is the guru's form. The root of pūjā is the guru's foot. The root of mantra is the guru's word. The root of mukti is the guru's grace.