Bhagavad Gita 8.22
पुरुषः स परः पार्थ भक्त्या लभ्यस्त्वनन्यया।
यस्यान्तःस्थानि भूतानि येन सर्वमिदं ततम्।।8.22।।
Purushah sa parah partha bhaktya labhyastvananyaya
Yasyantahsthani bhutani yena sarvamidam tatam
Simple meaning, written by AIO Partha, that supreme Purusha is attained through exclusive devotion. All beings dwell within him, and by him all this is pervaded.