Shaykh Saalih Aali Shaykh (may Allah preserve him) stated:

The fear which emanates from the heart comes as a result of the weakness of (one’s) Taqwaa and Eemaan. 

Source: Asbaab Lil Wiqaayah minas-Sihr wal-‘Ayn

Translated by: Abu Yusuf Khaleefah
11th of Dhul Qi’dah, 1435 (6th of September, 2014)
Masjid Nur Allah, LeFrak City, Corona, NYC