SB 6.5.9

kathaṁ sva-pitur ādeśam
 avidvāṁso vipaścitaḥ
anurūpam avijñāya
 aho sargaṁ kariṣyatha
Synonyms: 
katham — how; sva-pituḥ — of your own father; ādeśam — the order; avidvāṁsaḥ — ignorant; vipaścitaḥ — who knows everything; anurūpam — suitable for you; avijñāya — without knowing; aho — alas; sargam — the creation; kariṣyatha — you will perform.
Translation: 
Alas, your father is omniscient, but you do not know his actual order. Without knowing the actual purpose of your father, how will you create progeny?