Abhinava Klesha (Attachment complex): The mind is the abode of all desire, sorrows, likes, dislikes, attachment and aversions. In spite of knowing that the mind is the culprit, which causes attachment to Samsara (trans migratory existence and attendant miseries), man is unable to detach himself from his mind or otherwise control its vagaries and thereby to escape from sorrows and suffering. This is termed as Attachment complex.
Asthita Klesha (Vacillation complex): The world is full of various vishaya (sense objects) which entice the weak-minded persons who go on flirting from one sense object to another, not realising that these Vishaya (sense objects) will ultimately turn out to be Visham (poison) which deprives them of all sense of discrimination and dispassion. As a result of this men are plunged in endless suffering throughout their lives. This is termed as Asthita Klesha (the Complex caused by mental unsteadiness).
Lobha Klesha (Greed complex): Labouring under the delusion that the goal of life is to acquire gold, wealth, vehicles, mansions and the like, man toils ceaselessly from dawn to dusk, to acquire and hoard such possessions beyond his needs. In the process he foregoes even food and sleep, thereby endangering his health. In spite of knowing that all such possessions are temporary, he pollutes his mind by excessive greed and falls a victim to untold suffering and sorrow. This is known as the Lobha Klesha (Greed complex).
Dvesha Klesha (Hate complex): For his own selfish ends, man gets trapped in a maze of unending desires of various kinds. And when his desires are not fulfilled, he unreasonably blames it all on other men as well as on God Himself and thus he develops hatred against both man and God. hence this is designated as Dvesha Klesha (Hate complex).
All these complexes are nothing but mental aberrations, which are injurious to man himself. Having become a victim of such aberrations, man forgets his real Atmic nature and falls a prey to all kinds of sorrow and misery. In this world we find very few people who are always blissful. A large majority of people are found to be swinging between joy and sorrow. There are some others who are always sad and depressed and have never tasted bliss even once. There again, are some others, who are not bothered about anything and who lead a sort of mechanical life like animals. What is the reason for such a state of affairs? It is not due to Prakriti but due to the different ways in which man is influenced by his own mind. (SSS Vol.26, pp. 220-222)