“Call upon Allah while being certain of being answered, and know that Allah does not respond to a supplication from the heart of one heedless and occupied by play.”  

قَالَ رَسُولُ اللَّهِ ﷺ ادْعُوا اللَّهَ وَأَنْتُمْ مُوقِنُونَ بِالإِجَابَةِ وَاعْلَمُوا أَنَّ اللَّهَ لاَ يَسْتَجِيبُ دُعَاءً مِنْ قَلْبٍ غَافِلٍ لاَهٍ