अम्भांसि जलजन्तूनां दुर्गं दुर्गनिवासिनाम्।
स्वभूमिः श्वापदादीनां राज्ञां सैन्यं परं बलम्॥
For fish, water is home; for beasts, forests; for kings, their army is the highest power. A contextual verse on strength being domain-specific.