“Mental stability is the king wielding power over the mind.
Fix it and it remains immovable like the
Powerful Lord of Mountains.
Project it and it engages in all constructive aims.
It induces an exhilarating sense of feeling physically and mentally fit.
Realizing this, the yogis with powerful command
Continuously devote themselves to absorbed concentration,
Overcoming the enemy, mental distraction.
The ennobling, impeccable Lama has practiced like that.
Let me, too, who strives for liberation,
Cultivate myself in the same way.”
From The Concise Treatise on the Stages of the Path to Enlightenment also known as Song of the Stages of the Path by Je Tsong Khapa As translated in: The Abbreviated Points of the Graded Path by Tsongkhhapa. Translated by Alex Berzin. PDF available from The Berzin Archives.