One verse

Srimad Bhagavatam 10.20.37

10.20.37

नैवाविदन् क्षीयमाणं जलं गाधजलेचरा: । यथायुरन्वहं क्षय्यं नरा मूढा: कुटुम्बिन: ॥ ३७ ॥

naivāvidan kṣīyamāṇaṁ jalaṁ gādha-jale-carāḥ yathāyur anv-ahaṁ kṣayyaṁ narā mūḍhāḥ kuṭumbinaḥ

na
not
eva
indeed
avidan
appreciated
kṣīyamāṇam
diminishing
jalam
the water
gādha-jale
in shallow water
carāḥ
those who move
yathā
as
āyuḥ
their life span
anu-aham
every day
kṣayyam
diminishing
narāḥ
men
mūḍhāḥ
foolish
kuṭumbinaḥ
living with family members

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.