Vaishnava Samhita. Gopinatha Charitam. Vol II Book VI Chp 6 Shloka 30

यत्सुखं गुरुदेवस्य सर्वप्रथमसङ्गमे  |
तत्सुखं बत केनापि विस्मर्तुं नैव शक्यते  ||

The divine joy experienced at the first meeting with the gurudeva can never be forgotten by a person in his lifetime.