He has placed on each of the planets of the universe everything their inhabitants could possibly need, so that each of them can live happily by fulfilling their duty, and ultimately attain salvation by adhering to the regulative principles given by the Vedas, the original holy scriptures.

For all practical purposes, know that the material universe is created to satisfy the whims of eternally conditioned souls, just like the toys given to unruly children; it has no other use. But when those who inhabit it are seized by the intoxication of the supposed power conferred by material science, they then illicitly exploit the resources of nature (coal, oil, gas, various minerals, etc.), without the Lord's approval, and for the sole purpose of satisfying their senses, then it becomes necessary for the Lord to descend to punish the rebels and protect the devout and the believers.

The Lord says to this effect: Whatever a great man does, the majority of people always follow in his footsteps; the entire world follows the standard he sets by his example. There is no duty in the three worlds that I must fulfill; I need nothing, nor do I desire anything. And yet, I lend myself to action, for if I did not act, all men would follow the path I had thus traced. If I refrained from acting, all the galaxies would sink into desolation. Because of me, man would produce unwanted offspring. Thus, I would disturb the peace of all beings. In fulfilling his duty, the ignorant person attaches himself to the fruits of his labor. The enlightened person also acts, but without attachment, for the sole purpose of guiding the people to the right path.

What is true sacrifice?

True sacrifice is not the act of sacrificing an animal; no, true sacrifice is the ceremony through which one seeks to please the Supreme Personality of Godhead, to please Him.

Every human being must seek to know whether God is pleased with their behavior and actions. In other words, all our actions should contribute to the Lord's satisfaction. Each of us must be concerned with whether Krishna, the Supreme Personality of Godhead, is pleased with our actions. Activities aimed at pleasing the Lord are prescribed in the holy scriptures, and performing them constitutes sacrifice.

In other words, sacrifice is the act of acting for the satisfaction of the Supreme Lord, Krishna.

Let us be aware that any act performed other than sacrifice binds its performer to matter and holds them captive in this material world. If we do not act for the pleasure of the Supreme Lord, Krishna, then we will be chained to the consequences of our actions. We should not act for our own pleasure, but for God's.

This is what is meant by sacrifice.