Prophet Muḥammad (pbuh&h) stated about the description of Aṣ-ṣirāṭ ۱:

“The way of justice is narrower than hair and sharper than sword! [A two-edged sword]”

This means, if someone slips on the justice way, s/ he will fix in the vices and deviates from the Aṣ-ṣirāṭ.

Moderation and salvation path are in fact a single way; which is the same justice path.

That is the way which ends to the Emergence.

Satan seeks to exclude man from the path of justice and wisdom [The right way],

and to make her/ him wander in excessiveness and dissipation (immoderation)

In one of the Wisdoms, the lord of pious people “Amir al-Mu’minin Imam” Ali (pbuh) stated,

“لا تَری الجاهِلَ اِلاّمُفرِطاً اَو مُفَرِّطاً”

In this wisdom his majesty [Imam Ali (pbuh)] believes that, a person who has not reached the modest level of reason and is ignorant, will always remain in extremism.

Such and individual never achieves moderation, but also Satan will overcome him/her.

۱-As-Sirāt is the hair-narrow bridge which every human must pass on the Yawm ad-Din (“Day of the Way of Life” i.e. Day of Judgment) to enter Paradise.

Majlisī, A., Biḥār al-Anwār’, V.70, P.270

Musawi, M. [Sayyid Raḍi], Nahj al-balāgha, wisdom 70, P.638