Śivasaṃhitā 5.181

Three days of uninterrupted practice to «see»—a surprisingly brief timeframe indicating the speed of perception when prāṇa has been adequately prepared. The interdependence of haṭha and rāja is not a hierarchy but a double helix: physical and mental discipline co-create each other, and neither can reach its fullness without the other.

Nirantara is without interruption, tri-dina three days, paśyati sees or perceives directly, dhruvam certainly, haṭha force/effort (ha = sun, ṭha = moon, the union of opposites), rāja the real, the regent. The instruction to begin with haṭhayoga reflects the logic of bodily preparation before mental.

This teaching on the interdependence of haṭha and rāja yoga decisively influenced Svātmārāma when writing the Haṭhayogapradīpikā (15th century). That text would develop the same doctrine in more detail, establishing haṭhayoga as the necessary ladder for rājayoga culminating in samādhi. The Śiva-saṃhitā is one of its most direct predecessors.