When Individual Soul succeeds in removing by means of Knowledge the Darkness which covers him in consequence of Ignorance, then immutable Brahma becomes manifest.
ज्ञानेन हि यदा जन्तुरज्ञानप्रभवं तमः। व्यपोहति तदा ब्रह्म प्रकाशति सनातनम्॥