SB 12.2.1

śrī-śuka uvāca
tataś cānu-dinaṁ dharmaḥ
 satyaṁ śaucaṁ kṣamā dayā
kālena balinā rājan
 naṅkṣyaty āyur balaṁ smṛtiḥ
Word for word: 
śrī-śukaḥ uvāca — Śukadeva Gosvāmī said; tataḥ — then; ca — and; anudinam — day after day; dharmaḥ — religion; satyam — truth; śaucam — cleanliness; kṣamā — tolerance; dayā — mercy; kālena — by the force of time; balinā — strong; rājan — O King Parīkṣit; naṅkṣyati — will become ruined; āyuḥ — duration of life; balam — strength; smṛtiḥ — memory.
Translation: 
Śukadeva Gosvāmī said: Then, O King, religion, truthfulness, cleanliness, tolerance, mercy, duration of life, physical strength and memory will all diminish day by day because of the powerful influence of the Age of Kali.
Purport: 

During the present age, Kali-yuga, practically all desirable qualities will gradually diminish, as described in this verse. For example, dharma, which indicates a respect for higher authority that leads one to obey religious principles, will diminish.

In the Western world, theologians have been unable to scientifically present the laws of God or, indeed, God Himself, and thus in Western intellectual history a rigid dichotomy has arisen between theology and science. In an attempt to resolve this conflict, some theologians have agreed to modify their doctrines so that they conform not only to proven scientific facts but even to pseudoscientific speculations and hypotheses, which, though unproven, are hypocritically included within the realm of “science.” On the other hand, some fanatical theologians disregard the scientific method altogether and insist on the veracity of their antiquated, sectarian dogmas.

Thus bereft of systematic Vedic theology, material science has moved into the destructive realm of gross materialism, while speculative Western philosophy has drifted into the superficiality of relativistic ethics and inconclusive linguistic analysis. With so many of the best Western minds dedicated to materialistic analysis, naturally much of Western religious life, separated from the intellectual mainstream, is dominated by irrational fanaticism and unauthorized mystic and mystery cults. People have become so ignorant of the science of God that they often lump the Kṛṣṇa consciousness movement in with this odd assortment of fanciful attempts at theology and religion. Thus dharma, or true religion, which is strict and conscious obedience to God’s law, is diminishing.

Satyam, truthfulness, is also diminishing, simply because people do not know what the truth is. Without knowing the Absolute Truth, one cannot clearly understand the real significance or purpose of life merely by amassing huge quantities of relative or hypothetical truths.

Kṣamā, tolerance or forgiveness, is diminishing as well, because there is no practical method by which people can purify themselves and thus become free of envy. Unless one is purified by chanting the holy names of the Lord in an authorized program of spiritual improvement, the mind will be overwhelmed by anger, envy and all sorts of small-mindedness. Thus dayā, mercy, is also decreasing. All living beings are eternally connected by their common participation in the divine existence of God. When this existential oneness is obscured through atheism and agnosticism, people are not inclined to be merciful to one another; they cannot recognize their self-interest in promoting the welfare of other living beings. In fact, people are no longer even merciful to themselves: they systematically destroy themselves through liquor, drugs, tobacco, meat-eating, sexual promiscuity and whatever other cheap gratificatory processes are available to them.

Because of all these self-destructive practices and the powerful influence of time, the average life span (āyur) is decreasing. Modern scientists, seeking to gain credibility among the mass of people, often publish statistics supposedly showing that science has increased the average duration of life. But these statistics do not take into account the number of people killed through the cruel practice of abortion. When we figure aborted children into the life expectancy of the total population, we find that the average duration of life has not at all increased in the Age of Kali but is rather decreasing drastically.

Balam, bodily strength, is also decreasing. The Vedic literature states that five thousand years ago, in the previous age, human beings — and even animals and plants — were larger and stronger. With the progress of the Age of Kali, physical stature and strength will gradually diminish.

Certainly smṛti, memory, is weakening. In former ages human beings possessed superior memory, and they also did not encumber themselves with a terrible bureaucratic and technical society, as we have done. Thus essential information and abiding wisdom were preserved without recourse to writing. Of course, in the Age of Kali things are dramatically different.