Srimad Bhagavatam Canto 03, Chapter 08, Text 18

SB 3.8.18

ka esa yo ’sav aham abja-prstha
 etat kuto vabjam ananyad apsu
asti hy adhastad iha kiñcanaitad
 adhisthitam yatra sata nu bhavyam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Lord Brahma, in his ignorance, contemplated: Who am I that am situated on the top of this lotus? Wherefrom has it sprouted? There must be something downwards, and that from which this lotus has grown must be within the water.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The subject matter of the speculations of Brahma in the beginning regarding the creation of the cosmic manifestation is still a subject matter for mental speculators. The most intelligent man is he who tries to find the cause of his personal existence and that of the whole cosmic creation and thus tries to find the ultimate cause. If his attempt is properly executed with penances and perseverance, it is sure to be crowned with success.
Srimad Bhagavatam Canto 03, Chapter 08, Text 17
Srimad Bhagavatam Canto 03, Chapter 08, Text 19