Vivekachudamani 334

यतिरसदनुसन्धिं बन्धहेतुं विहाय 

स्वयमायामहमस्मीत्यात्मदृष्ट्यैव तिष्ठेत् । 

सुखयति ननु निष्ठा ब्रह्मणि स्वानुभूत्या 

हरति परमविद्याकार्यदुःखं प्रतीतम् ॥ 

yatirasadanusandhiṃ bandhahetuṃ vihāya 

svayamāyāmahamasmītyātmadṛṣṭyaiva tiṣṭhet | 

sukhayati nanu niṣṭhā brahmaṇi svānubhūtyā 

harati paramavidyākāryaduḥkhaṃ pratītam || 

(Sankaracarya's Vivekachudamani 334) 

The spiritual seeker should give up dwelling on the unreal, which causes bondage, and should always remain steadfast with thoughts fixed on the Self, thinking, 'I am This.' For, steadfastness in Brahman gained through the realization of one‘s identity with it, gives rise to bliss and thoroughly removes the misery born of nescience*, which one experiences in the state of ignorance. 

*Nescience (avidya) is not ignorance in the general sense of lack of information regarding something. Rather, it denotes a special form of ignorance—about the essential nature of the Self. All systems of Hindu philosophy agree that ignorance is the primary cause of our bondage to the world of becoming, i.e., samsara.