Let me break down the phrase:
* Consideras: This is the second-person singular form of the verb "considerar," which means "to consider" or "to believe."
* que: This is the conjunction "that."
* todos los hombres: This means "all men."
* son: This is the verb "to be" in the third-person plural form.
* iguales: This means "equal."
The phrase is a question about one's beliefs about equality among men.