We have not created the Heavens and the Earth, and all that lies between them but to manifest the Truth.The Hour of Doom is sure to come, so [Prophet] bear with them graciously.
Meaning:-
Manifest: to make clear or obvious to the eye or mind or the understanding; show plainly
Doom: death, destruction, or some other terrible fate.
Graciously: in a courteous, kind, and pleasant manner.