In Surat Qalam, verse 4 of the Holy Quran, Allah Subhanahu Wa Ta'ala says, ''Surely, you are upon a tremendous character(Khuluq Azeem)''. When A'isha was asked about the character of the Messenger of God, she answered, ''His character was the Quran''. She said that because he was unique in character, and that unique character had to bring together all noble character traits(makarimul akhlaq). God described that character as being '''tremendous'' just as He described the Quran in His words, ''the tremendous Quran''(15:87). So, the Quran is his character, Sallallahu alaihi Wasallam.
If a person in the community of the Messenger who has not met the Messenger of God desires to see him, let him look upon the Quran. When he looks upon it, there is no difference between looking upon it and looking upon God's Messenger. It is as if the Quran takes the configuration of a corporeal form which is named Muhammad Ibn Abdullahi Ibn Abd al-Muttalib.
The Quran is Allah's speech and His attribute, so Muhammad in his entirety is the attribute of God, ''So he who obeys the Messenger, has obeyed God''-(Quran 4:80), since ''He does not speak out of caprice''(53:3), Sallallahu alaihi Wasallam.
For further reading, see Prof. William C. Chittick's
''The Sufi Path Of Knowledge-Ibn Arabi's Metaphysics Of Imagination''.