The point is too peculiar to be ignored but is usually interpreted with reference to the composer's personality, such as that "Beethoven introduced himself with this work uniquely and boldly as an advancing symphonic composer and stood true to this statement throughout his compositional life." (See Wikipedia).
Can we not dwell just a little bit more on this point (and the symphony which follows) as a tool for contemplating on the nature of human thought (the subject of Iqbal's first question) through the medium of music without words?
Video: Symphony No.1, 1st Movement
Video: Symphony No.1, 2nd Movement
Video: Symphony No.1, 3rd Movement
Video: Symphony No.1, 4th Movement