[57] So on that Day no excuse of theirs will
avail the transgressors, nor will they be invited (then) to seek
grace (by repentance).
[58] Verily We have propounded for men, in this
Qur-an, every kind of parable: but if thou bring to them any Sign,
the Unbelievers are sure to say, "Ye do nothing but talk vanities."
[59] Thus does Allah seal up the hearts of those
who understand not.
[60] So patiently persevere: for verily the
promise of Allah is true: nor let those shake thy firmness, who have
(themselves) no certainty of faith.