यन्नेहास्ति न तत् क्वचित्॥
yannehāsti na tat kvacit||
"What is in here may be found elsewhere;
but what is not here can not be found anywhere else!"
This was proclaimed by Veda-Vyasa after composing the Mahabharata. Such is the comprehensive coverage of various aspects of human life in it! The Mahabharata is indeed called the fifth Veda (पञ्चमो वेदः) (see here). Find a nice brief on the great epic here.