तदहीनमवृद्धं च स्थापयेन्मित्रमर्थवित् ॥ कZ_०७.१८.३४च्द् ॥
tadahīnamavṛddhaṃ ca sthāpayen mitram arthavit
The knower of advantage should establish an ally who is neither deficient nor excessively strengthened.
Strong enough to be useful, but not so strong that it becomes a future threat or independent pole.