Here, this material world is kingdom of darkness. That you know, everyone. It is actually darkness. As soon as there is sun on the other side of this earth, it is darkness. That means by nature it is dark. Simply by sunshine, moonshine and electricity we are keeping it light. Actually, it is darkness. And darkness means ignorance also. Just like at night people are more ignorant. We are ignorant, but at night we are more ignorant.
So Vedic instruction is tamasi mā jyotir gama. The Vedas say: "Don't remain in this darkness. Just transfer yourself to the kingdom of light." And the Bhagavad-gītā also says that there is a special sky, or spiritual sky, where there is no need of sunshine, there is no need of moonlight, there is no need of electricity, and—yad gatvā na nivartante—and if anyone goes to that kingdom of light, he never comes back again to this kingdom of darkness.
So how we can transfer into that kingdom of light? The whole human civilization is based on these principle. The Vedānta says, athāto brahma jijṣāsā. Atha, ataḥ. "Therefore you should now inquire about Brahman, the Absolute." "Therefore, now" means . . . every word is significant. "Therefore" means because you have got this human body—"therefore." And ataḥ means "hereafter." "Hereafter" means you have passed through many, many lives, 8,400,000 species of life. Aquatics—900,000's.
Jalajā nava-lakṣāṇi sthāvarā lakṣa-viṁśati (Padma Purāṇa). This is the . . . Darwin has taken the idea of evolution from this Padma Purāṇa. You won't find any philosophy, any doctrine in the world which is not found in the Vedic literature. It is so perfect, everything is there.