A conditioned living being is endowed with four principles of malpractice, namely errors, insanity, inability and cheating. These are signs of imperfection, and out of the four the propensity to cheat others is most prominent. And this cheating practice is there in the conditioned souls because the conditioned souls are primarily in the material world imbued with an unnatural desire to lord it over the material world.
(Srimad Bhagavatam---1:14:4---purport).

In the modern age there is a tendency to do research by mental speculation and concoction. But the man who speculates forgets that he himself is subject to the four defects of nature: he is sure to commit mistakes, his senses are imperfect, he is sure to fall into illusion, and he is cheating. Unless one has perfect knowledge from disciplic succession, he simply puts forth some theories of his own creation; therefore he is cheating people.
(Srimad Bhagavatam---3:24:17---purport).

Although they dress themselves as sannyāsīs, they still cannot free themselves from the four principles of sinful life, namely illicit sex life, meat-eating, intoxication and gambling. Since they are not freed from these four principles, they are cheating the public by posing as svāmīs.
(Srimad Bhagavatam---3:24:35---purport).

Malam means: "contamination." We should learn to despise all the causes of devastation, beginning from irreligion and cheating, and then we shall be able to make advancement in a life of piety. The possibility of our attaining Kṛṣṇa consciousness will be easier, and we shall not be subjected to repeated devastation. The present life is repeated birth and death, but if we seek the path of liberation, we may be saved from repeated suffering.
(Srimad Bhagavatam---4:8:5---purport).

Therefore a devotee of Lord Kṛṣṇa is actually a perfect brāhmaṇa. His situation is transcendental, for he is free from the four defects of conditional life, which are the tendencies to commit mistakes, to be illusioned, to cheat and to possess imperfect senses. A perfect Vaiṣṇava, or Kṛṣṇa conscious person, is always in this transcendental position because he speaks according to Kṛṣṇa and His representative.
(Srimad Bhagavatam---4:21:42---purport).

Because demoniac people want to be cheated, so many cheaters are present to cheat them. At the present moment in this age of Kali-yuga, the entire human society has become an assembly of cheaters and cheated.
(Srimad Bhagavatam---4:26:6---purport).

Almost everything going on in this world as religion is devoid of any idea of devotional service and is therefore condemned by the verdict of Śrīmad-Bhāgavatam. Without devotional service, so-called religious principles are only cheating.
(Srimad Bhagavatam---7:11:7---purport).