we owe this much to our elders

वेदमनूच्य आचर्योऽन्तेवासिनमनुशास्ति। सत्यं वद। धर्मं चर। स्वाध्यायान्मा प्रमदः। आचार्याय प्रियं धनमाहृत्य प्रजातन्तुम् मा व्यवच्छेत्सीः। सत्यान्न प्रमथितव्यं। । धर्मान्न प्रमथितव्यं। कुशलान्न प्रमथितव्यं। स्वध्यायप्रवचनाब्याम् न प्रमथितव्यं। देवपितृकार्यान्न प्रम्थितव्य्ं। मातृदेवो भव। पितृ देवो भव। आचार्यदेवो भव। अतिथिदेवो भव। यान्यनवद्यानि कर्माणि। तानि सेवितव्यानि। नो इतराणि। यान्यस्माकं सुचरितानि। तानि त्वयोपास्यानि नो इतराणि।
तैत्तरीय उपनिषद्  शिक्षावलली   ११ भागः

vedamanūcya ācaryo'ntevāsinamanuśāsti | satyaṁ vada| dharmaṁ cara| svādhyāyānmā pramadaḥ| ācāryāya priyaṁ dhanamāhṛtya prajātantum mā vyavacchetsīḥ| satyānna pramathitavyaṁ|  | dharmānna pramathitavyaṁ| kuśalānna pramathitavyaṁ| svadhyāyapravacanābyām na pramathitavyaṁ| devapitṛkāryānna pramthitavyṁ| mātṛdevo bhava| pitṛ devo bhava| ācāryadevo bhava| atithidevo bhava| yānyanavadyāni karmāṇi| tāni sevitavyāni| no itarāṇi| yānyasmākaṁ sucaritāni| tāni tvayopāsyāni no itarāṇi|
taittarīya upaniṣad  śikṣāvalī   11 (bhāgaḥ)

On completion of the term of imparting vedic knowledge perfectly the preceptor gives the following advice to his disciple.
 SPEAK THE TRUTH..
Follow the ordained conduct.
Never develop indifference to the reciting and study of the scriptures.
 At the time of departure, it is your bounden duty to offer the gift which the preceptor likes most.
 Go ahead and marry in the appropriate way so that your family lineage is not broken.
 Never fail to pay attention to whatever truth is spoken to you.
Never fail to perform the duty ordained to you.
Never be careless about the things which are proper and good for you.
 Never shy away from propagating and teaching what you have learned. 
You should never be negligent in offering to the gods and the manes(departed elders in the family line) what is expected of you. 
Let your mother be GOD to you.
 Let your father be GOD to you.
 Let your guru be GOD to you. 
Treat your guests as equal to God. 
You should only indulge in actions which are irreproachable and have the stamp of approval of scriptures and the laws of society. 
Never move away from such proper path.
 You must emulate the good practices we (your preceptors) have been following and you should never deviate from the path shown by us (your gurus)

Taittariya upanishad is a supporting text to Krishna yajurvedam.
 One would marvel at the clinically precise advise the guru imparts as the guidelines at the time of a person leaves the School.
 Can we imagine  any modern house of Knowledge improvising on this? 
Please note.    the first and  foremost advise given is to SPEAK THE TRUTH