Translation:

75. In that case We should have made thee taste an equal portion (of punishment) in this life and an equal portion in death: and moreover thou wouldst have found none to help thee against Us!

Notes (Tafseer)

2271. If such a thing was possible for a true Messenger of Allah, viz.: a compromise with evil and a dereliction of his mission, he would be no exception to the law of personal responsibility. Indeed, as the power and the responsibility were greater, the punishment would have been greater too. It would have been double,-an exposure in this life and the usual punishment in or after death for a desertion of Truth.

2272. The motive held out by the world for a compromise with Truth is itself fallacious. The motive is that the compromise may bring influence, position, and opportunity, if not wealth and the other good things of life. But these themselves (if attained) would be of no use or help if pitted against the command of Allah.