Bismillahir Rahmaanir Raheem
One of the signs of gaining the Ma’rifah (Recognition) of Allah Ta’ala is to be granted the Taufeeq of Du’aa (supplication).
Duas made sincerely, fulfilling the necessary conditions are always accepted. However, Allah Ta’ala, in His Wisdom, answers Duas in different ways.
Rasulullah (Sallallaahu ‘alayhi wasallam) has said : “Any Muslim who makes a Dua and his Dua does not contain a request for anything sinful or anything regarding the severance of family ties, Allah grants him one of three things most assuredly; namely,
What he has asked is granted immediately, or
What he has asked is saved for him as a treasure in the Aakhirah, or
Allah wards away some calamity from him in lieu of the object asked for.”
…A person should therefore not feel that his or her Duas are rejected.
Hazrat Ya’qoob (‘alaihis Salaam) on being separated from his beloved son, Hazrat Yusuf (‘alaihis Salaam) made Du’aa for 40 years before Allah Ta’ala re-united him with his son. The Dua was most certainly accepted – more so, since it was the Dua of a Nabi of Allah Ta’ala – but Allah Ta’ala knows best where, when and how Du`aa is to be accepted.
 Aakhirah : Hereafter