SB 12.4.39

etāḥ kuru-śreṣṭha jagad-vidhātur
 nārāyaṇasyākhila-sattva-dhāmnaḥ
līlā-kathās te kathitāḥ samāsataḥ
 kārtsnyena nājo ’py abhidhātum īśaḥ
Synonyms: 
etāḥ — these; kuru-śreṣṭha — O best of the Kurus; jagat-vidhātuḥ — of the creator of the universe; nārāyaṇasya — of Lord Nārāyaṇa; akhila-sattva-dhāmnaḥ — the reservoir of all existences; līlā-kathāḥ — the pastime narrations; te — to you; kathitāḥ — have been related; samāsataḥ — in summary; kārtsnyena — entirely; na — not; ajaḥ — unborn Brahmā; api — even; abhidhātum — to enumerate; īśaḥ — is capable.
Translation: 
O best of the Kurus, I have related to you these narrations of the pastimes of Lord Nārāyaṇa, the creator of this world and the ultimate reservoir of all existence, presenting them to you only in brief summary. Even Lord Brahmā himself would be incapable of describing them entirely.