Matsya Purana 220.17

220.17

guravaste yathā pūrvaṃ teṣu yatnaparo bhavet.
pitṛpaitāmahaṃ mitramamitrañca tathā ripoḥ .. 220.17 ..

Then he should conquer the external foes. These outside enemies are of various classes according as they are equal to him or under his control or quite accidental and so artificial arising out of needs, and they should be treated with greater or less caution as they belong to the former or latter class—16

[The friends are of three kinds (1) as they are the friends of the father and the grandfather, (2) the enemy's enemy, and (3) an acquired friend arising out of necessity Among them the previous kinds of friends are superior—17 18