KAṬHA UPANISHAD · 2.1.2

पराचः कामाननुयन्ति बालास्ते मृत्योर्यन्ति विततस्य पाशम् ।
अथ धीरा अमृतत्वं विदित्वा
ध्रुवमध्रुवेष्विह न प्रार्थयन्ते ॥ २॥

parācaḥ kāmānanuyanti bālāste mṛtyoryanti vitatasya pāśam ।
atha dhīrā amṛtatvaṃ viditvā
dhruvamadhruveṣviha na prārthayante ॥ 2॥

The rest childishly follow after desire and pleasure and walk into the snare of Death who gapeth wide for them. But calm souls having learned of immortality seek not for permanence in the things of this world that pass and are not.

Sri Aurobindo · CWSA 18, p. 117