SB 6.10.6

nūnaṁ svārtha-paro loko
na veda para-saṅkaṭam
yadi veda na yāceta
neti nāha yad īśvaraḥ

nūnam—certainly; sva-artha-paraḥ—interested only in sense gratification in this life or the next; lokaḥ—materialistic people in general; na—not; veda—know; para-saṅkaṭam—the pain of others; yadi—if; veda—know; na—not; yāceta—would ask; na—no; iti—thus; na āha—does not say; yat—since; īśvaraḥ—able to give charity.

Those who are too self-interested beg something from others, not knowing of others' pain. But if the beggar knew the difficulty of the giver, he would not ask for anything. Similarly, he who is able to give charity does not know the beggar's difficulty, for otherwise he would not refuse to give the beggar anything he might want as charity.

This verse describes two people—one who gives charity and one who begs for it. A beggar should not ask charity from a person who is in difficulty. Similarly, one who is able to give charity should not deny a beggar. These are the moral instructions of the śāstra. Cāṇakya Paṇḍita says, san-nimitte varaṁ tyāgo vināśe niyate sati: everything within this material world will be destroyed, and therefore one should use everything for good purposes. If one is advanced in knowledge, he must always be prepared to sacrifice anything for a better cause. At the present moment the entire world is in a dangerous position under the spell of a godless civilization. The Kṛṣṇa consciousness movement needs many exalted, learned persons who will sacrifice their lives to revive God consciousness throughout the world. We therefore invite all men and women advanced in knowledge to join the Kṛṣṇa consciousness movement and sacrifice their lives for the great cause of reviving the God consciousness of human society.