Muṇḍaka Upaniṣad 3.1.10

3.1.10

yaṃ yaṃ lokaṃ manasā saṃvibhāti viśuddhasattvaḥ kāmayate yāṃś ca kāmān.
taṃ taṃ lokaṃ jayate tāṃś ca kāmāṃs tasmād ātmajñaṃ hy arcayed bhūtikāmaḥ.

10. Whatever world a man of purified nature makes clear in mind,
And whatever desires he desires for himself—
That world he wins, those desires too.
Therefore he who is desirous of welfare should praise the knower of the Soul (Ātman).