Although the Guide of the universe and the Refuge for all creatures is present, he hasn’t still emerged.[ it is his occultation era].
Is it believable that he isn’t present?? Believer feels this presence in his/her hearts.

The People who usually sit and pray,

and recite Nudba prayer2 attentively and also read Ziarat Aal-e-Yaseen1 and cry, they do all wisely .
They feel the presence of that honorable man (hgr) though he has not emerged yet, and is occulted.

Collecting date:
Mr. Khamenei; the leader, (1996/1/7)

۱-Ziarat Aal-e-Yaseen is an important Ziarat of Imam-e-Zaman(a.s.). It is actually a Hadith Qudsi (direct saying of Allah(swt)) as reported in Mafatih-al-Jinnan.
۲- It is recited on Fridays after sunrise in lamentation & other occasions -Remembering the Imam Zaman( hgr)