CHĀNDOGYA UPANISHAD · 3.14.3

एष म आत्मा अन्तर्हृदये ऽणीयान् व्रीहेर् वा यवाद् वा सर्षपाद् वा श्यामाकाद् वा श्यामाकतण्डुलाद् वा ।
एष म आत्मा अन्तर्हृदये ज्यायान् पृथिव्या ज्यायान् अन्तरिक्षाज् ज्यायान् दिवो ज्यायान् एभ्यो लोकेभ्यः ॥

eṣa ma ātmā antarhṛdaye ’ṇīyān vrīher vā yavād vā sarṣapād vā śyāmākād vā śyāmākataṇḍulād vā ।
eṣa ma ātmā antarhṛdaye jyāyān pṛthivyā jyāyān antarikṣāj jyāyān divo jyāyān ebhyo lokebhyaḥ ॥

He is my self within the heart, smaller than a corn of rice, smaller than a corn of barley, smaller than a mustard seed, smaller than a canary seed or the kernel of a canary seed. He also is my self within the heart, greater than the earth, greater than the sky, greater than heaven, greater than all these worlds.

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