my take on the knight of cups overall is that of the most vulnerable love, be that within ourselves or our children, especially the first born, male or female. The repose of the four of swords can often appear as a defensive position, especially after a wound of some kind be that financial or someone's feelings were "bled".
It is possible that the combination is informing you of a time when it is necessary to take stock in someones feelings that were wounded, perhaps told by the three of swords as well. By taking stock I would suggest have a considerably honest discussion with self to see if there was an offense upon your self that was pacified prematurely or if you may have offended someone else and are accepting a peaceful response that was only meant to placate.
Surprisingly there is another practical interpretation, in short, this may just be an identity of someone who has bought a new car. The defensive four of swords can also be what is perceived as the four sides of an automobile.
Take your pick.