Bhagavad Gita · Chapter 1: Arjuna's Despair
Bhagavad Gita 1.11
अयनेषु च सर्वेषु यथाभागमवस्थिताः ।
भीष्ममेवाभिरक्षन्तु भवन्तः सर्व एव हि ॥
ayaneṣu ca sarveṣu yathābhāgamavasthitāḥ | bhīṣmamevābhirakṣantu bhavantaḥ sarva eva hi ||
So all of you, holding your assigned positions on every front, must protect Bhishma above all.
Modern context
The whole plan rests on keeping one old man alive. Any effort that depends on a single person is fragile, however strong that person is.