When Yogi starts seeing all beings within himself and himself in all, then he attains the Brahman state.

यथा स्वप्रभया केवलः स्फटिकोपलः ।

भाति उपाधिहीनो विमलस्तथैवात्मा प्रकाशते ॥

~ Just as a crystal-gem is illumined by its own (clean) radiance, similarly the aatman, which is pure, without any upadhi remains self-illuminated.

ज्ञानस्वरूपमेवाहुर्जगदेतद्विचक्षणाः

अर्थस्वरूपमेवाज्ञाः पश्यन्त्यन्ये कुबुद्धयः ॥ 

~ Intelligent people call this world as the form of knowledge (appearance), but the retarded (fool) consider it to be real (true).

कूटस्थो निर्गुणो व्यापी चैतन्यात्मा स्वभावतः । दृश्यते ह्यरूपेण पुरुषैर्भ्रान्तदृष्टिभिः ॥ २९ ॥ यथा संलक्ष्यते व्यक्तः केवलः स्फटिको जनैः । रक्तिकाव्यवधानेन तद्वत्परमपूरुषः ॥ ३०

~ To the delusional people, the kutastha, nirguna, all-pervading in nature, the atma-tattva in the form of consciousness also appears like a substance. Just as people see even a pure crystal stone as red due to contact with a red substance, similarly there is a misconception about the atma tattva.

तस्मादात्माक्षरः शुद्धो नित्यः सर्वगतोऽव्ययः ।उपासितव्यो मन्तव्यः श्रोतव्यश्च मुमुक्षुभिः

~ That is why the Mumukshu should contemplate, contemplate, listen and research only the alphabet, pure, eternal, omnipresent, indestructible, self-tattva.

यदा मनसि चैतन्यं भाति सर्वत्रगं सदा ।योगिनोऽव्यवधानेन तदा सम्पद्यते स्वयम् ॥

~ When the light of the all-pervading Consciousness always remains in the mind of a yoga practitioner, then he attains the atma-Tattva.

यदा सर्वाणि भूतानि स्वात्मन्येवाभिपश्यति ।सर्वभूतेषु चात्मानं ब्रह्म सम्पद्यते स्वयम् ॥

~ When he (yogi) starts seeing all beings within himself and himself in all, then he attains the Brahman state.

Sri Rama Gita