ātmaiva hy ātmano bandhur
ātmaiva ripur ātmanaḥ
uddharet — one must deliver; ātmanā — by the mind; ātmānam — the conditioned soul; na — never; ātmānam — the conditioned soul; avasādayet — put into degradation; ātmā — mind; eva — certainly; hi — indeed; ātmanaḥ — of the conditioned soul; bandhuḥ — friend; ātmā — mind; eva — certainly; ripuḥ — enemy;ātmanaḥ — of the conditioned soul.
Only by the Self can one uphold oneself, and only by the Self can one degrade oneself. Self is the friend of oneself, and its enemy as well.
The purpose of Yoga is to see the mind clearly and to draw it away from attachment to sense objects. It is stressed the mind must be trained so well, it can deliver the soul from the mire of ignorance.
In material existence one is influenced by the mind and sense perception. We are entangled in the material world because the mind is in false ego, which desires and grasps.
The mind can be trained so that it will not be attracted by the material world, and the conditioned soul may be liberated from bondage.
The more one is attracted by sense objects, the more one becomes entangled in material existence. The best way to disentangle is to keep the mind focused in pure consciousness.
"For man, mind is the cause of bondage and mind is the cause of liberation. Mind absorbed in sense objects is the cause of bondage, and mind detached from the sense objects is the cause of liberation." ~Amrta-bindu Upanishad