If lie becomes popular in scientific environments, scientistsand scholars will not trust on the speeches, narrations, and judgements of each other, and thus everybody should personally suffer all required labors for a scientific research, and could not use the results of thousands years of others' life. And this type of lie is the ugliest and dirtiest one.

Lie ,source of all sins

In several narrations, it is referred to this reality that trustand truth cause purity of action, and lie is the key of all types of sins.

For better understanding of effect of truthfulness and lie onthe man's deeds and actions, first we refer to a number ofnarrations from Prophet's House A. S. in this regard, and thenwe will analyze it.

Imam Ali A. S. says:.

«الصِّدْقُ يَهْدِي الَى الْبِرِّ وَ الْبِرُّ يَدْعُو الَى الْجَنَّةِ» ..

Truthfulness guides people to goodness, and goodness invitesto paradise.. [1]

Imam Sadegh A. S. says:

«اذا صَدَقَ الْعَبْدُ قالَ اللَّهُ: صَدَقَ و بَرَّ، وَ اذا كَذِبَ قالَ اللَّهُ كَذَبَ وَ فَجَرَ» ..

When a God's servant says the truth, God says: he said thetruth and performed a good deed, and when he lies, He says: he lied and performed an evil deed!. [2]

Imam Askari A. S. says:

جُعِلَتِ الْخَبائِثُ كُلُّها فِي بَيْتٍ وَ جُعِلَ مِفْتاحُها الْكَذِبُ» ..

[1]

Tabarsi, Meshkatol Anvar, 003, Heydarieh Publications, Najaf

[2]Thesame document ,page 992