महाभारत - धर्मज्ञः

चत्वारि यस्य द्वाराणि सुगुप्तान्यमरोत्तमाः ।
उपस्थमुदरं हस्तौ वाक्चतुर्थी स धर्मवित् ॥

- महाभारत

chatvAri yasya dvArANi suguptAni amaro uttamaaH ।
upastham udaram hastau vAk chaturthI sa dharmavit ॥

- mahAbhArata

There are four doors through which adharma can enter us – private parts, stomach, hands and speech. If one guards these doors carefully at all the time, he will be known as Dharmajna and avoid all sins. All sins are related to man losing control of these doors.

- Mahabharata