(… وَهَٰذَا كِتَابٌ أَنزَلْنَاهُ ) (And this is a Book which We have sent down,…): Here, the Arabic verb used for (sent down) is a transitive verb. In this form, it brings the meaning that the Holy Quran was sent down from the (The Preserved Tablet) to the sky of the earth (i.e., the first heaven), as Allah (swt) says:
إِنَّا أَنزَلْنَاهُ فِي لَيْلَةِ الْقَدْرِ
(Indeed, We sent this (Quran) down on the Night of Power) (Al-Qadr: 1)
(… مُبَارَكٌ… ) (…blessed …): There are many characteristics which have been mentioned to describe the Book of Allah (swt). However, the characteristic which is mentioned the greatest number of times is (Blessed). For example, Allah (swt) says:
كِتَابٌ أَنزَلْنَاهُ إِلَيْكَ مُبَارَكٌ لِّيَدَّبَّرُوا آيَاتِهِ وَلِيَتَذَكَّرَ أُوْلُوا الْأَلْبَابِ
((This is) a blessed Book which We have revealed to you (O Prophet) so that they may contemplate its verses, and people of reason may be mindful) (Saad: 29)
In order to explain the word (Blessed), we will give this example: Say you brought some food which would be enough for two people, but instead, five people came to eat it. You would of course be amazed that this small amount of food which could only suffice two people had fed five people! Therefore, the size of the gift is bigger than the size of the structure, which is basically what blessed means.
So, the meaning of the Quran being Blessed is that, although it is only a book, its gifts will never deplete. Rather, these gifts will be extended over the eras and throughout the centuries. If the gifts of the Holy Quran had been exhausted during the period of its revelation, the function of the Quran would have stalled after one century and it would be like reading a book from the past. However, the Quran is blessed, thus its gifts will be on-going, via the treasures amassed in it, till the Day of Standing. This is because, as the human mind develops, it will extract from the Book of Allah that which corresponds to this development in every place and time. As such, the Prophet (saws) has said regarding the Holy Quran:
“It is the one that the desires cannot distort, nor can the tongues twist it, nor can the scholars ever have enough of it, and it shall not become dull from reciting it much, and the amazement of it does not diminish.”
 Sunan at-Tirmidhi, The Book of Virtues of the Quran, Chapter of the blessings of the Quran, Hadith No. 2906.