The Knight of Vessels (or Cups) is the card of emotion (cups) in action (knights).
As I wrote earlier about this card:
In the Waite Deck, the Knight of Cups is reminiscent of the Death card, so there is an echo of transition present.
Coming after Death turned up yesterday, this card seems like an omen of some sort. A message arrives to stir the heart, or, as I posted on IG this morning, it may be the arrival of an emotional message cloaked in obscurity.
Whether or not this card is a harbinger of profound change, I will be on the lookout for whatever message is on its way.