One verse

Srimad Bhagavatam 10.50.19

10.50.19

श्रीभगवानुवाच न वै शूरा विकत्थन्ते दर्शयन्त्येव पौरुषम् । न गृह्णीमो वचो राजन्नातुरस्य मुमूर्षत: ॥ १९ ॥

śrī-bhagavān uvāca na vai śūrā vikatthante darśayanty eva pauruṣam na gṛhṇīmo vaco rājann āturasya mumūrṣataḥ

śrī-bhagavān uvāca
the Supreme Lord said
na
do not
vai
indeed
śūrāḥ
heroes
vikatthante
boast vainly
darśayanti
they show
eva
simply
pauruṣam
their prowess
na gṛhṇīmaḥ
We do not accept
vacaḥ
the words
rājan
O King
āturasya
of one who is mentally agitated
mumūrṣataḥ
who is about to die

The Supreme Lord said: Real heroes do not simply boast but rather show their prowess in action. We cannot take seriously the words of one who is full of anxiety and who wants to die.