Imam explains the matter through his theological books as following:
A station of which the Imams, peace be with them, and the great divine prophets were constantly seeking greater knowledge and more perfect awareness, and wanted to obtain such a source of light and greatness.
“And enlighten the eyes of our hearts with the light of the radiance of looking at you, until the vision of the hearts tears through the curtains of light and is then united with the source of greatness.” The banquet of Allah is that very “source of greatness”.
God, the Blessed and Exalted, has invited His servants to enter the source of light and greatness.
However, if the servant is not appropriate, he will not be able to enter into such a splendid and sumptuous position. God, the Exalted, has invited his servants to all sorts of favors and boons and to numerous spiritual pleasures, but if they are not prepared to be present at such lofty positions, they will not be able to enter.
How can one enter the presence of the Lord and the guest house of the Lord of lords which is the source of greatness with spiritual pollution, vices, and sins of the body and soul? It requires merit.
Preparation is necessary. In disgrace and with polluted hearts which are covered by veils of darkness, one will not be able to understand these spiritual meanings and truths.
One must tear these veils and push aside these dark and light curtains which cover the heart and are barriers to union with Allah so that one will be able to enter the brilliant and splendid divine company.