COMMENTARY on 4:68
A. Yusuf Ali:

Translation:
And We should have shown them the Straight Way. 585
Commentary:

585  Four advantages of obedience to Allah are mentioned, in the order in which they will appeal to the beginner in faith: (1) his own benefit ("best for them"); (2) strengthening of his faith, as he becomes more and more at home in the spiritual world; (3) reward from Allah's own Presence, such intense conviction that no further arguments are needed; (4) the Straight Way, in which there is no doubt or difficulty whatever in our practical conduct.