Surah ad-Dhariyat (The Scattering Winds) 51 : 58

Explanatory Note 

When man rises to this sublime level of worship, or servitude to God, and maintains it, he will disdain any resort to foul means in order to achieve a noble end, even when this end is none other than to achieve victory for God's message. Foul means will, for one thing, destroy the noble meaning of worship. For another, a believer is not concerned with achieving goals. He is only concerned with the fulfilment of his duty. Goals and ends are left to God to determine in accordance with His will.

Moreover, a servant of God who attends to his worship in this way will enjoy ease of conscience, reassurance and a happy state in all situations, whether he sees the outcome of his efforts or not, and whether they bring the results he hoped for or not. He has done his duty and made sure of his reward once he has fulfilled the concept of worship in his work. The outcome is outside his remit. He knows that he is a servant of God. Therefore, in his feelings and appeals, he does not exceed the limits of a servant. He knows that God is the Lord. Therefore, he does not encroach on what belongs to the Lord. He thus earns God's acceptance and He is happy with what God gives him.