Fear Allah and hope for every good thing from Him..

Abdullah ibn Mubarak (rahimahullah) said about fear:
When night befalls, they endure it
and see it through bowing in ruku.
Fear has released their sleep, so they stand
and acquire security in vigilance.

Hasan ibn Hani (rahimahullah) composed the following (it has been credited to Imam Shafi`ee (rahimahullah)):

Fear Allah and hope for every good thing from Him;
Don’t follow your adamant self, lest you regret it;
Remain in between hope and fear
and you will rejoice with the Pardon of Allah if you submit.

[Muajjamul Udaba: 17/303 credited to Imam Shafi`ee and also in the Divan of Hasan.]