Śrīmad-Bhāgavatam · Text 10.20.37
Who is speaking and story frame
नैवाविदन् क्षीयमाणं जलं गाधजलेचरा: ।
यथायुरन्वहं क्षय्यं नरा मूढा: कुटुम्बिन: ॥ ३७ ॥
naivāvidan kṣīyamāṇaṁ
jalaṁ gādha-jale-carāḥ
yathāyur anv-ahaṁ kṣayyaṁ
narā mūḍhāḥ kuṭumbinaḥ
The fish swimming in the increasingly shallow water did not at all understand that the water was diminishing, just as foolish family men cannot see how the time they have left to live is diminishing with every passing day.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.