Sincere supplication

'Abdu'r-Rahman ibn Yazid said, "Ar-Rabi' used to go to 'Alqama every Friday. When I was not there, they would send for me. Once he came when I was not there. 'Alqama met me and told me, 'Did you not see what ar-Rabi' brought? He said, "Do you not see how frequently people make supplication and how rarely they are answered? That is because Allah Almighty only accepts the sincere supplication."' I asked, 'Didn't 'Abdullah say that?' He asked, 'What did he say?' I said that 'Abdullah said, 'Allah does not listen to someone who wants other people to hear not someone who shows off nor who plays. He only listens to the one who makes a supplication firmly from his heart.' He said, 'Did he mention 'Alqama?' 'Yes' was the answer."

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، قَالَ: حَدَّثَنَا أَبِي، قَالَ: حَدَّثَنَا الأَعْمَشُ قَالَ: حَدَّثَنِي مَالِكُ بْنُ الْحَارِثِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ قَالَ: كَانَ الرَّبِيعُ يَأْتِي عَلْقَمَةَ يَوْمَ الْجُمُعَةِ، فَإِذَا لَمْ أَكُنْ ثَمَّةَ أَرْسَلُوا إِلَيَّ، فَجَاءَ مَرَّةً وَلَسْتُ ثَمَّةَ، فَلَقِيَنِي عَلْقَمَةُ وَقَالَ لِي: أَلَمْ تَرَ مَا جَاءَ بِهِ الرَّبِيعُ؟ قَالَ: أَلَمْ تَرَ أَكْثَرَ مَا يَدْعُو النَّاسَ، وَمَا أَقَلَّ إِجَابَتَهُمْ؟ وَذَلِكَ أَنَّ اللَّهَ عَزَّ وَجَلَّ لاَ يَقْبَلُ إِلاَّ النَّاخِلَةَ مِنَ الدُّعَاءِ، قُلْتُ: أَوَ لَيْسَ قَدْ قَالَ ذَلِكَ عَبْدُ اللهِ؟ قَالَ: وَمَا قَالَ؟ قَالَ: قَالَ عَبْدُ اللهِ: لاَ يَسْمَعُ اللَّهُ مِنْ مُسْمِعٍ، وَلاَ مُرَاءٍ، وَلا لاعِبٍ، إِلا دَاعٍ دَعَا يَثْبُتُ مِنْ قَلْبِهِ، قَالَ: فَذَكَرَ عَلْقَمَةَ؟ قَالَ: نَعَمْ.