From Islamic point of view every action which is not useful is regarded as vain...

From Islamic point of view every action which is not useful is regarded as vain: "Successful indeed are those who shun all that is vain." (Surah al-Mu'minun, 23:3) (11) Importance of Lawful Transactions, Circulation of Wealth and Transfer of Money and Property: All such deals must be free from every kind of fraud and underhand dealing.

Any transaction otherwise will be unfair: "And do not usurp one another's property by unjust means." (Surah al-Baqarah, 2:188) Transfer of wealth by means of gambling is tantamount to swindling and is unlawful. (12) Any profit on the capital lying idle, not in circulation for beneficial purposes, and not subject to loss and diminishing which takes the form of a debt or a security is usury and unlawful.

(13) Every financial transaction must be conducted with the full knowledge and prior information of both the parties. Any transaction which involves a loss owing to lack of information is void. "The Prophet has forbidden fraudulent transactions". This hadith originally relates to the fraudulent sale of defective items, but the principle of ijtihad has made the rule general. (14) Contrariety to Reason: Islam respects reason and describes it as an inward prophet (guide).

The principles of religion are not acceptable unless they conform to the results of rational research. In subsidiary matters relating to religion reason has been recognized as a source of ijtihad. Islam regards reason as a sort of purity and lack of it as a sort of ritual impurity. According to Islamic law insanity or intoxication invalidates minor ablution (Wuzu) just like urination or sleeping. Islam combats the use of every kind of intoxicant, because of its contrariety to reason.

Reason is an integral part of religion. (15) Contrariety to Will: Just as Islam respects reason, and in Islamic law there are certain provisions to protect it, Islam also respects will, which is the power which carries out the dictates of reason. That is why Islam considers all diverting activities which hinder the use of will-power to be prohibited and unlawful. In the language of Islam such diverting activities are called "Lahw". (16) Work: Islam is opposed to idleness and lethargy.

As man receives much from society, he must do something for the benefit of society as well as for the benefit of himself. It is his duty to exert himself to do some useful work. An idle man's mind is the devil's workshop, as the proverb goes.