Six in the fifth place is the best reading in Progress and it asks the querent to stop keeping score. Repentance disappears, the advance is fortunate in every direction, and the single instruction is not to be concerned with losing or gaining. Somebody drawing this line is usually still auditing the situation out of a habit formed in harder positions, and the text is telling them the habit is now the only liability left in it.
The seat is the ruling one, a yielding stroke at the centre of the trigram of brightness, incorrectly placed by the ordinary rule and entirely unbothered by that. Progress is a figure about being seen and recognised rather than about forcing anything through, and softness at its ruling seat suits the work. The commentary offers congratulation, a word the classic uses sparingly, and it offers it for the movement itself rather than for anything obtained by the movement.
When the line changes, the upper trigram Li becomes Qian and the figure becomes Standstill, King Wen 12, heaven above and earth below with nothing passing between them. That is the sharpest caution the classic could attach to the best line of a hexagram, and it is well placed. Brightness at this seat is what keeps the exchange open, and an advance that hardens into pure strength at the top stops being progress and becomes a blockage.