Why did Imam Khomeini call Ghadir the greatest Eid of Islam?

Ghadir is completion of religion, Imam Khomeini explained

Imam Khomeini through his theological works and historical messages maintained that Ghadir is the completion of the religion, the perfection of God’s greatest bounty, the most magnificent feast of Allah; it is the feast for the righteous people, followers and supporters of the holy Prophet of Islam.

Imam explains about someone who pays no attention to anything other than the dark wilderness

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

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.

Imam believed children should be taught about Islamic laws.

A memoir by Mrs Fatema Tabatabai - Imam's daughter in law

What had been significance of Eid al Adha from Imam Khomeini’s viewpoint?

Imam Khomeini's emphasis on the importance of Arafeh day.