The Vedas are compared to the desire tree because they contain all things knowable by man. They deal with mundane necessities as well as spiritual realization. The Vedas contain regulated principles of knowledge covering social, political, religious, economic, military, medicinal, chemical, physical and metaphysical subject matter and all that may be necessary to keep the body and soul together. Above and beyond all this are specific directions for spiritual realization.
-Shrimad Bhagavatam Canto 1 Chapter 1 Verse 3, Translation and Purport

धृतराष्ट्र उवाच
धर्मक्षेत्रे कुरुक्षेत्रे समवेता युयुत्सव: ।
मामका: पाण्डवाश्चैव किमकुर्वत सञ्जय ॥ १ ॥
Dhṛtarāṣṭra said: O Sañjaya, after my sons and the sons of Pāṇḍu assembled in the place of pilgrimage at Kurukṣetra, desiring to fight, what did they do?
-BG 1.1