Fikr (contemplation) is the lamp of the heart. In its absence, the heart will be without light. Minus fikr, the heart resembles a dark room in which there is no lamp. One does not know what lurks in that dark room in which nothing is visible. Similarly, without contemplation the reality and true nature of an object will not be fathomed.
When man contemplates, the inner nature and reality of things will be revealed to him.
He will see with open eyes (i.e. his spiritual eyes) the realities of Truth, Falsehood, the perishable nature of the world and the everlasting nature of the Hereafter. The Glory, Splendour, Power and Wrath of Allah, as well as Him being the True Benefactor will become vivid realities.
Man will also become aware of his own hidden defects, the schemes and deceptions of his nafs and that the world is the abode of futility and deception.