Why did Imam Khomeini always used to pay particular attention to morality?

Imam Khomeini stresses that impeccability [ismat] is perfect faith

Imam Khomeini has stressed that If man is certain and has faith that all the outward and inward worlds are in the presence of the Lord, and that God, the Exalted, is present everywhere and sees everything, in the presence of God and God’s blessings there would be no possibility for committing sins.

Imam had great devotion prayers in youth.

A memoir by Ayatollah Subhani – Imam's student

Moral decline, a psychic state in which a person wishes for the deprivation of a blessing, Imam ...

Imam Khomeini: If a path becomes a path of justice, then a human being must not be afraid of ...

Sahifeh-ye-Imam. V 7, P 257

Imam Khomeini assured believers that God will make you a man of great distinctions

Imam Khomeini advised the believers to ask from God the forgiveness, He will readily forgive them, and will cover up their blemishes and past deeds.

Imam Khomeini: Our deeds are the essential ingredients of Heaven and Hell.

Sahifeh-ye-Imam, V 4, P 29

Imam Khomeini had great amount of certainty while deciding on import issues

Extracted from a series of memoirs about Imam Khomeini