That is how the proverb

"Truth is a castle" came about. A castle in a dream also represents its owners, an army's fortification, or it may represent knowledge, the Qur'an, or it could mean seeking refuge in God's protection from the evils of the accursed Satan and his armies, such as deities, preposterous or exaggerated titles, etcetera. The towers of a castle in a dream represent the leaders. Its battlement represents the solders and spies. Its gates represent the guards. Its fortress represents the minister. Its hospices and barns represent the clan or the coffers. It is also said that a castle in a dream could represent an infallible and a strong person. Seeing it from a distance. means rising in rank or guarding one's chastity. (Also see Citadel; Fortress)