गुरुं प्रयोजनोद्देशादर्चयन्ति न भक्तितः ।

दुग्धदात्रीति गौर्गेहे पोष्यते न तु धर्मतः ॥

#दृष्टान्तकलिकाशतकम्

They serve Guru with the aim of (getting)some benefit,but not out of devotion https://rankhaya.com/.(And example)A cow is raised in a house because it gives milk,not out of a feeling of dharma