The enlightened preceptor imparts knowledge to all his disciples alike

वितरति गुरुः प्राज्ञे विद्यां यथैव तथा जडे

न तु खलु तयोर्ज्ञाने शक्तिं करोत्यपहन्ति वा ।

भवति हि पुनर्भूयान् भेदः फलं प्रति तद्यथा

प्रभवति शुचिर्बिंबग्राहे मणिर्न मृदादयः ॥ – उत्तररामचरित

vitarati guruH prAjne vidyAM yathaiva tathA jaDe

na tu khalu tayoH jnAne shakti karoti apahanti vA ।

bhavati hi punaH bhUyAn bhedaH phalaM prati tad yathA

prabhavati shuchiH bimbagrAhe mRut AdayaH ॥ – uttararAmacharita

The enlightened preceptor imparts knowledge to all his disciples alike, irrespective of whether the student is a brilliant one or is very dull intellectually. The lessons or even the capacity or earnestness of the teacher really adds or takes away nothing beyond a certain optimal level from the subject matter of the lesson. The lessons, by themselves do not add either fortune or lack of it to the recipient of the knowledge. However, we see substantial variation in quality of enlightenment received by the individual disciples. While a gem of crystal receives the brilliance of light falling on them and reflect it with greater resplendence, the same light falling on a heap of mud keeps the mud simply dark..