Imam Ali (pbuh) stated many times,

“The restless ones who look forward to the Emergence, will perish. But the ones who believe it isn’t late, will be saved.”
First: an individual’s haste doesn’t make God to hurry!!
Second: one shouldn’t be carefree and indifferent to this important point.
Imam Sadiq (pbuh) stated,

«إنَّهُم یَرَنَهُ بَعیدا و نَراهُ قَریبا»
“The opponents of the Emergence, consider it late. But we see it soon [through our insight]”

The last word
By the supreme leader:

The one who looks forward to the Emergence, is expected to strengthen continuously the characteristics and features which are needed to have in the emergence era.
And this looking forward is in a way that,
One should neither take it late,

nor take it too soon!

[But] warning! It is [surely] soon.
So, neither stay late…nor hurry up.

۱. هَلَک المَحاضیرُ وَ نَجَا المُقَرّبون (کافی/ج۸/ص۲۹۴)
1-Halaka al- Mahazir wa Naja al- Muqarrabin, ( Kāfī, Vol. 8, P. 294)
Mahazir means hasters, (al-Ghayba Numani), P. 196

2- [It has been collected] in a meeting with teachers, experts, authors and specialized and graduates of Messianic [here Messianic is of Imam Mahdi (hgr)] (7/9/2011)