Learn Farsi: خود مشکل ناشی از کمبود تعقل است. - The problem itself stems from a lack of reasoning.

ta'aqqol (reasoning/reflection) comes from the root ع-ق-ل (ayn-qaf-lam), which is the base for words like aql (intellect). When you place this root into the ta-C1-a-C2-C2-o-C3 (tafa'ol) pattern, the middle root letter (qaf) is doubled. Form V nouns often describe an adopted or deliberate action, so here it refers to the deliberate act of applying one's intellect.

Why does the sentence use khod-e moshkel instead of placing khod after the noun?

Placing khod before the noun and linking it with an ezafe creates an emphatic meaning: khod-e moshkel means "the problem itself." If you placed it after the noun as a possessive, like moshkel-e khodesh, it would completely change the meaning to "his/her own problem."

How does nashi az work to mean "stems from"?

nashi is a word of Arabic origin meaning "arising" or "originating." In Farsi, it operates as a set phrase and is almost always followed by the preposition az (from) to express the cause or root of a situation, translating smoothly to "caused by" or "stemming from."

How is the word kambood constructed?

It is a native Farsi compound word made by combining kam (little/few) and bood (the past stem of "to be" or "existence"). Literally meaning "little existence," it is the standard word for "lack," "shortage," or "deficit."