Vivekachudamani 353

इत्थं विपश्चित्सदसद्विभज्य

निश्चित्य तत्त्वं निजबोधदृष्ट्या ।

ज्ञात्वा स्वमात्मानमखण्डबोधं

तेभ्यो विमुक्तः स्वयमेव शाम्यति ॥ ३५३ ॥

itthaṃ vipaścitsadasadvibhajya

niścitya tattvaṃ nijabodhadṛṣṭyā |

jñātvā svamātmānamakhaṇḍabodhaṃ

tebhyo vimuktaḥ svayameva śāmyati || 

(Sankaracarya Vivekachudamani 353)

Thus the wise person, discriminating between the Real and the unreal, determining the Truth by the insight of his knowledge and realizing his own Self to be indivisible Knowledge, becomes free and attains peace by himself.

Sankara first explained that which constitutes things unreal. Then he explained that which constitutes the Real. A wise man should discriminate between the Real and the unreal in the manner already explained. By rational thinking and close observation, he determines the Truth by a process of discrimination. Through the vision of the Higher; he ultimately comes to experience consciousness in all its purity.

When one realizes one's own Self to be pure knowledge, one gets liberated from the ignorance of spirituality, the veiling(avarana) gets lifted and the identification with the non-spiritual and its consequent agitations(vikshepa) end. When these obstacles, "veiling" and "projection", are removed the individual comes to experience quietude-Divine.

All obstacles are completely eliminated when an individual apprehends his spiritual nature,

1) through intelligent discrimination between the Self and the not Self 

2) through detachment from the not-self; and 3)by complete identification with the self.