Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
त्रिविधा रिपवो ज्ञेयाः कुल्यानन्तरकृत्रिमाः ।पूर्वपूर्वो गुरुस्तेषां दुश्चिकित्स्यतमो मतः ॥ २१ ॥
In the full Agni Purana this is chapter 233, verse 21.
Know that enemies are of three kinds: of the family, next door, and made by a cause. Each earlier one is the heavier. It is held the hardest to deal with.
Simple meaning: There are three kinds of enemy: of the family, next door and made. The first is the hardest.
अनन्तरोऽपि यः शत्रुः सोऽपि मे कृत्रिमो मतः ।
Even a next-door enemy is a made enemy. The enemy has his own friends and enemies too.
पार्ष्णिग्राहमुपायैश्च शमयेच्च तथा स्वकम् ।
Calm the enemy at the rear by the right means. Using a friend to cut down an enemy is praised.
मित्रं च शत्रुतामेति सामन्तत्वादनन्तरम् ।
A friend can turn into an enemy. A king who can do it alone should cut down the enemy himself.