In other words, compared to those who are begging favours of Allah, He will surely confer some better reward on a person who remains so occupied with committing the Qur'an to memory or learning and understanding it that he hardly gets time for du'a (prayer).

It is commonly known that when a man distributes sweets, or something else amongst others, a share is set aside for the person who cannot attend the function because of the task of distribution given to him by the distributor himself.
In another hadith, in the same context, it is mentioned that Allah would give such a person a better reward than what He would give to His ever grateful servants.