Shaykh al-Islam Ibn Taymiyyah (may Allaah have mercy on him) said:  “No doubt adhkaar and du’aa’s are among the best forms of worship, and worship is one of the matters in which there is no room for personal opinions – we have to follow what the Prophet  (peace and blessings of Allaah be upon him) did and taught, not our own whims and desires or innovations. The du’aa’s and adhkaar of the Prophet  (peace and blessings of Allaah be upon him) are the best that anyone could find. The one who follows this way will be safe and sound, and the benefits and positive results that he will gain are beyond description. Any other du’aa’s and adhkaar may be haraam or they may be makrooh; they may involve shirk even though most people do not realize that – the details of this would take too long to explain here.

No one has the right to teach the people any kinds of du’aa’s or adhkaar apart from those that are mentioned in the Sunnah, or to make it a kind of regular worship which he expects the people to do regularly as they do the five daily prayers – this is the innovation in religion which Allaah does not allow… As for adopting a wird or regularly reciting a dhikr that is not prescribed in sharee’ah, this is one of the things that is not allowed. The du’aa’s and adhkaar prescribed by sharee’ah are the best that anyone could ever hope to find, and no one ignores them in favour of newly-invented, innovated adhkaar except one who is ignorant, negligent or a wrongdoer.” (Majmoo’ al-Fataawa, 22/510-511).

And Allaah knows best