According to Imam, why self purification is difficult at old age?

Imam Khomeini warned against gratifying the carnal appetites and desires

Imam Khomeini through his works warned that all our deeds shouldn't serve as the means for satisfying our desires and gratifying the carnal appetites.

Total attachment to this world gradually immerses the person in various sins and offences, Imam ...

Imam Khomeini stresses that total attachment to the material world gradually immerses the person in various sins and offences.

Imam never attended a gathering of back-biting.

A memoirs by Seyyed Ahmad Khomeini, Imam’s son

Imam guarded himself against any possible sin or backbiting.

A memoir by Seyyed Izzad al-Din Zanjani

Imam Khomeini stressed need for purifying intentions

Imam Khomeini recommended the faithful people of purifying their intentions, rectifying their deeds and expelling love of self .

Human have proofs for existence of God and reality of the Resurrection, Imam Khomeini explains

Imam Khomeini explains difference between knowledge and faith by saying "sometimes you see that one has knowledge of these realities but has no faith."

Religious duties should be performed for divine sake

Imam Khomeini through his theological works explains that all religious duties should be performed for the sake of God the Almighty.