Muhammad Asad:Translation:
In time We shall make them fully understand 49 Our messages [through what they perceive] in the utmost horizons [of the universe] and within themselves, 50 so that it will become clear unto them that this [revelation] is indeed the truth. [Still,] is it not enough [for them to know] that thy Sustainer is witness unto everything? 51
49 Lit., "We will show them" or "make them see".
50 I.e., through a progressive deepening and widening of their insight into the wonders of the universe as well as through a deeper understanding of man’s own psyche - all of which points to the existence of a conscious Creator.
51 I.e., that He is almighty and all-seeing: a fundamental truth which, by itself, should be enough to remind man of his responsibility before Him.