Six in the fourth place, as a changing line, favors calling on companions honestly rather than relying on one's own accumulated resources or standing. A querent shown this line is asked to descend lightly, fluttering rather than dropping with the weight of display, and to draw neighbors into the matter through sincerity instead of impressing them with wealth already possessed.
Flipping this line changes the upper trigram from Kun to Zhen, Thunder, giving Zhen over Qian, the hexagram called Great Power. The light, humble descent of the fourth line gives way, on the far side of change, to a hexagram of vigorous strength moving upward with real force, thunder above heaven rather than earth quietly receiving it. The movement is from a deliberately modest gesture toward an assertive one, suggesting that humility honestly offered here can, once changed, become the confident strength Great Power describes, rather than remaining permanently self effacing.
Within Peace's arc, the fourth line is the point where the upper trigram's receptive character first answers the lower trigram's rising strength, matching arriving greatness with a willing, unpretentious welcome. A reading landing here suggests that present success depends on this kind of light, sincere outreach to others, and that it carries within it the seed of a far more forceful advance still to come.