CHĀNDOGYA UPANISHAD · 8.2.1

स यदि पितृलोककामो भवति ।
संकल्पाद् एवास्य पितरः समुत्तिष्ठन्ति ।
तेन पितृलोकेन संपन्नो महीयते ॥

sa yadi pitṛlokakāmo bhavati ।
saṃkalpād evāsya pitaraḥ samuttiṣṭhanti ।
tena pitṛlokena saṃpanno mahīyate ॥

'Thus he who desires the world of the fathers, by his mere will the fathers come to receive him, and having obtained the world of the fathers, he is happy.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)