﴿ وَمَا يَذْكُرُونَ إِلَّآ أَن يَشَآءَ ٱللَّهُ ۚ هُوَ أَهْلُ ٱلتَّقْوَىٰ وَأَهْلُ ٱلْمَغْفِرَةِ ﴾

“But they [who do not believe in the life to come] will not take it to heart unless God so wills: [for] He is the Fount of all God-consciousness, and the Fount of all forgiveness.”

Advice, howsoever reasonable and well-supported by arguments, can be effective only when the hearer is serious about it. If the hearer is not serious, the advice will not reach his heart. Such arguments as deeply move a serious-minded person, will only cause a frivolous person to engage in meaningless discussions.