One verse

Srimad Bhagavatam 11.5.17

11.5.17

एत आत्महनोऽशान्ता अज्ञाने ज्ञानमानिन: । सीदन्त्यकृतकृत्या वै कालध्वस्तमनोरथा: ॥ १७ ॥

eta ātma-hano ’śāntā ajñāne jñāna-māninaḥ sīdanty akṛta-kṛtyā vai kāla-dhvasta-manorathāḥ

ete
these
ātma-hanaḥ
killers of the self
aśāntāḥ
devoid of peace
ajñāne
in ignorance
jñāna-māninaḥ
presuming to have knowledge
sīdanti
they suffer
akṛta
failing to perform
kṛtyāḥ
their duty
vai
indeed
kāla
by time
dhvasta
destroyed
manaḥ-rathāḥ
their fanciful desires

The killers of the soul are never peaceful, because they consider that human intelligence is ultimately meant for expanding material life. Thus neglecting their real, spiritual duties, they are always in distress. They are filled with great hopes and dreams, but unfortunately these are always destroyed by the inevitable march of time.