Abu Hurairah relates Allah’s Messenger (peace and blessings of Allah be to him) as saying, “A strong believer is better and more loveable to Allah than a weak believer, and there is good in everyone, (but) cherish that which gives you benefit (in the Hereafter) and seek help from Allah and do not lose heart, and if anything (in the form of trouble) comes to you, don’t say: If I had not done that, it would not have happened so and so, but say: Allah did that what He had ordained to do and your ‘if’ opens (the gate) for the Satan.”(Sahih Muslim)
This hadīth is very much significant in the sense that it determines the role and function of Destiny in the life of a believer. Belief in Divine Decree is a source of unfailing strength and power rather than a pretext for indolence and inactivity. It makes a Muslim a powerful person of invincible will and firm determination and strong conviction. Thus failures or so-called misfortunes of life neither dampen his spirit nor make him a pessimist. A true believer faces the hardships of life bravely and manfully with the strong hope that God would help him overcome them. And even if he fails to overcome them here in the earthly life, he would have his reward in the Hereafter.
A believer has his eyes set on the future and hand in the living present and does not waste his time in the involvement of ‘ifs’ and ‘buts’, in which the non-believers in Destiny are commonly found involved.