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Śrīmad-Bhāgavatam
[Canto 3, Ch. 11]
Bhāgavatam  is the full text of all descriptions of knowledge, including the theory of atomism. The atom is the minute subtle form of eternal time.
TEXT 2
सत एव पदार्थस्य स्वरूपवस्थितस्य यत् । कैवल्यं परममहानविशेषो निरन्तरः ॥ २ ॥
sata eva padārthasya svarūpāvasthitasya yat kaivalyam parama-mahān aviśeṣo nirantaraḥ
sataḥ —of the effective manifestation;  eva —certainly;  pada-arthasya —of physical bodies;  svarūpa-avasthitasya —staying in the same form even to the time of dissolution;  yat —that which;  kaivalyam —oneness;  parama —the supreme;  mahān —unlimited;  aviśeṣaḥ —forms;  nirantaraḥ —eternally.
TRANSLATION
Atoms are the ultimate state of the manifest universe. When they stay in their own forms without forming different bodies, they are called the unlimited oneness. There are certainly different bodies in physical forms, but the atoms themselves form the complete manifestation.
TEXT 3
एवं कालोऽप्यनुमितः सौक्ष्म्ये स्थौल्ये च सत्तमः । संस्थानभुक्त्या भगवानव्यक्तो व्यक्तभुग्विभुः ॥ ३ ॥
evam kālo'py anumitaḥ saukṣmye sthaulye ca sattama saṁsthāna-bhuktyā bhagavān avyakto vyakta-bhug vibhuḥ
evam —thus;  kālaḥ —time;  api —also;  anumitaḥ —measured;  saukṣmye —in the subtle;  sthaulye —in the gross forms;  ca —also;  sattama —O best;  saṁsthāna —combinations of the atoms;  bhuktyā —by the motion;  bhagavān —the Supreme Personality of Godhead;  avyaktaḥ —unmanifested;  vyakta-bhuk —controlling all physical movement;  vibhuḥ —the great potential.