The Lord God Giveth Light unto the Understanding

Nephi describes some of the qualities of God’s communication with His children on earth:

“…My soul delighteth in plainness; for after this manner doth the Lord God work among the children of men. For the Lord God giveth light unto the understanding; for he speaketh unto men according to their language, unto their understanding” (2 Nephi 31:3)

Questions:

-Why does God use plainness in His interactions with mortals? If He didn’t use plainness, would only those with “superior” intellects be able to understand God? As it is, is there anyone who cannot understand God’s messages?

-How are God’s messages conveyed to you? Do others receive His messages differently?

-How does God give light unto the understanding?

-Why does God use the specificity of the earth’s languages rather than only relying on the ineffable witnesses of the Spirit?