The philosophy in attaining to the excellence that is characteristic of the rank of the Truthful is that firstly, a person must realise their own weakness and helplessness. Then, in accordance with their individual strength and ability, they must proclaim اِيَّاكَ نَعْبُد (Thee alone do we worship) and adopt the truth, whilst abandoning falsehood. They must flee far from all forms of filth and impurity which are associated with falsehood. They must promise that they will never speak a lie, or give false testimony. They must promise that they will not allow the desires of the inner self to move them to utter any falsehood whatsoever, either as vain speech, neither in the cause of good, nor to repel evil—in no way and under no circumstances will they adopt falsehood. Now, when a person makes a promise that is as widely encompassing as this, they act upon the words اِيَّاكَ نَعْبُد (Thee alone do we worship) in a special way and such action is worship of the highest degree.
The words اِيَّاكَ نَعْبُد (Thee alone do we worship) are followed by اِيَّاكَ نَسْتَعِيْن (Thee alone do we implore for help). Now, whether a person of the nature just described proclaims the latter by verbal profession or not, Allah the Exalted, nonetheless, who is the source of all grace and the fountainhead of all truth and rectitude, will definitely help and support such an individual, and open to them the sublime principles and verities of truth. It is an established fact that when a person involved in business follows ideal practices and principles, and holds fast to honesty and integrity, even if he starts with a penny, Allah the Exalted grants them hundreds and thousands of rupees in return for their penny.
(Malfuzat [English], Vol. 2, p. 80)