How Imam Khomeini does sheds lights on characteristics of a true believer?

Imam Khomeini: The safeguard Islam itself is the most important obligations.

Sahifeh-ye-Imam, V 21, P 409

God Almighty, grant us the capacity to realize our responsibilities

Imam Khomeini, the late founder of the Islamic Republic advised believers to pray God the Almighty to "Grant us a share of the light of Your knowledge."

Human being miserably fails to grasp the extent of his own small world, Imam Khomeini explained

Imam Khomeini through his theological works explained that human being, a creature crawling on one of the smallest planets miserably fails to grasp the extent of his own small world, whose sun cannot be compared with far greater suns of innumerable galaxies.

Imam Khomeini's class on morality over weekends had great spiritual impact on seminary students

Impressions from Imam Khomeini's biography

One of the moral maladies is maltreatment of other people, Imam Khomeini explained

Imam Khomeini through his theological works explained that one of the moral maladies is the maltreatment of the people of his household, his neighbors, his colleagues and others around him.

Imam Khomeini explained how the secrets of this world are to be unveiled

Imam explained how human are mistaken to consider the world of the hidden realities, where the secrets of this world are to be unveiled and your deeds are to be disclosed,

Believer never backbites, never slanders others, Imam Khomeini explained

Imam Khomeini through his theological works explained that a faithful person never backbites, never slanders others, and he is never vengeful or envious of his brothers in faith.