KAṬHA UPANISHAD · 1.3.11

महतः परमव्यक्तमव्यक्तात्पुरुषः परः ।
पुरुषान्न परं किंचित्सा काष्ठा सा परा गतिः ॥ ११॥

mahataḥ paramavyaktamavyaktātpuruṣaḥ paraḥ ।
puruṣānna paraṃ kiṃcitsā kāṣṭhā sā parā gatiḥ ॥ 11॥

And higher than the Great Self is the Unmanifest and higher than the Unmanifest is the Purusha: than the Purusha there is none higher: He is the culmination, He is the highest goal of the journey.