From 'The Tuan Commentary says: Waiting means waiting' down to 'with the correct center.' The Correct Meaning states: This explains the Judgment of Waiting. 'Xu' means waiting.
'Danger is ahead' explains the name of the hexagram: it has the meaning of waiting, hence it says 'Waiting means waiting.' 'Danger is ahead' explains why waiting is required: because perilous difficulty lies ahead, one must wait before advancing.
'Firm and strong without being trapped, its meaning is not to be brought to exhaustion' explains why the way of waiting achieves success: due to Qian's firmness and strength, though encountering danger ahead, it is not trapped or stalled, so its meaning of waiting does not involve exhaustion; thus it attains 'brilliant success, perseverance brings good fortune' through the virtue of Qian.
'Waiting: there is sincerity, brilliant success, perseverance brings good fortune; occupying the heavenly position with the correct center' reiterates the Judgment's text and then explains it.
It says that this substance of Waiting not only attains Qian's firmness and strength to avoid being trapped, but also relies on the power of centrality and correctness.
With Nine in the Fifth Place occupying the Son of Heaven's position, and being yang in a yang place, it is correct and central; thus it can possess trust, be brilliantly successful, and bring good fortune through perseverance.
Being firm and strong without being trapped derives solely from the virtues of the two component images; occupying the heavenly position with the correct center is the virtue of Nine in the Fifth Place.
Generally, in the substance of hexagrams, some draw virtue directly from images, some directly from lines, and some combine both images and lines; this hexagram is an example of the latter.
Regarding the commentary 'Refers to the fifth line' down to 'perseverance brings good fortune,' the Correct Meaning states: 'The way of waiting is perfected' means that the way of waiting first requires trust, and subsequently brings brilliance, free course, and perseverance with good fortune for all things.
To be capable of all these is to bring the way of waiting to completion. The fifth line occupies the heavenly position, being yang in the honored place; being central, it is without bias, and being correct, it is without crookedness.
Using this to await things, all that is undertaken will succeed; hence 'the way of waiting is perfected.' 'Advantageous to cross the great river: going brings merit.'
The Correct Meaning states: This explains the meaning of 'advantageous to cross the great river': because Qian is firm and strong, moving through danger brings achievement.
Regarding the commentary 'The virtue of Qian' down to 'always succeeds,' the Correct Meaning states: Earlier it said 'firm and strong without being trapped,' and here it says 'going brings merit'; firmness and strength are Qian.
Therefore, when the virtue of Qian gains advancement, going and achieving merit means that wherever it goes, it always succeeds.
Although this explains 'advantageous to cross the great river,' it also encompasses the meaning of 'brilliant success' above; it is because of 'brilliant success' that one attains 'advantageous to cross the great river,' hence success is clarified through crossing the great river.