Why did Imam Khomeini put emphasis on spiritual construction of nation?

Imam stressed the need to be certain in faith and trust in God Almighty

According to Imam Khomeini, 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.

Spiritual construction has priority over all others, Imam Khomeini explained

Imam Khomeini stressed that the country and the nation are in need of construction, and spiritual construction has priority over all others. The spiritual and physical struggle for the cause of God should begin from the ‘self’; to fight against the internal Satan. This jihad will be the basis of other jihads and struggles.

What are some of important discussions Imam included in his famous work “Forty Hadith”?

Imam Khomeini's famous work "Forty Hadith" contains treasures of mysticism

The original work in Persian, published under the title “Arba’in, ya chihil hadith” was written by Imam Khomeini about a half century ago. The book contains treasures of mysticism and spirituality.

Islamic Revolution set the stage for a new global anti-imperialist struggle

One of the most overlooked aspects of the Islamic Revolution in Iran, which worked to topple Western domination of the country, is its global impact, from a re-configuration of Middle-Eastern resistance to imperialism, to international partnerships in the fight against US hegemonic endeavors.

Imam Khomeini: The greatest jihad is the jihad against selfish desires and egoism, because all ...

Imam Khomeini stressed self-purification as prelude to correct society

Imam Khomeini through his theological works stressed that one who seeks to purify a society will not be able to achieve one's goal if one's self is not purged and purified.