Why are our duas (supplications) not answered?

It is because we know Allah but we do not obey Him; we know the Messenger :saw: but we do not follow his Sunnah; we know the Quran but we do not act in accordance to it; we eat from the blessings of Allah but we do not give thanks for them; we know Paradise but we do not seek it; we know Hell but we do not flee from it; we know the shaytaan but we do not fight him rather we agree with him; we know death but we do not prepare for it; we have buried the dead but we do not take lesson from that and we ignore our own faults but are preoccupied with the faults of others. (Qurtubi)