Knight of Cups – Love and Relationship Outcome
The Knight of Cups in a Tarot reading is someone who brings a message, an invitation or makes a proposition, this maybe with regard to questions of sex or personal affairs, there are strong emotions and feelings. He is graceful and enthusiastic rather than a warrior, he may put women on a pedestal is easily impressed and may have psychic abilities.
In the reversed position he is capable of trickery, fantasy, and a vivid imagination.
Knight of Cups – As a Man, Outcome and Feelings
(On account of the twelfth house) A stranger, sailor or naval officer, man coming from far away. It makes one forget troubles, perhaps intoxicates. Wine or strong liquors. Merchants of same. Narcotics. Imagination, vision, dreams, poetic turn of mind. Occultism. Devotion, sacrifice, charity. (On account of the eighth house): Strong sexual tendencies, but the power to master them, and extract from them the element of happiness and health: transmutation of inner forces. The latter may also be translated as: changing his aspect of life wholly: going from one state of life into a quite different sort of existence. In some cases: falsehood, venomous reports, slander, blackmail, trickery, fraud, subtlety, swindling, artifice. The evil influences may cause the reasons for the said change of life, which in itself may well prove benefic after all. There is much occultism in this card; this Knight may be unknown or anonymous but a very important messenger (to the soul?) At its best he is Saint George, killing the dragon, the Rosicrucian brother. A. E. Thierens, 
Knight of Cups
Pictorial Key to the Tarot – Rider-Waite-Smith
By A.E. Waite (1911), tarot card illustrations by Pamela Colman Smith (1911)
Graceful, but not warlike; riding quietly, wearing a winged helmet, referring to those higher graces of the imagination which sometimes characterize this card. He too is a dreamer, but the images of the side of sense haunt him in his vision.
Meanings Knight of Cups in a Reading
Arrival, approach–sometimes that of a messenger; advances, proposition, demeanour, invitation, incitement.
Knight of Cups – Reversed
Trickery, artifice, subtlety, swindling, duplicity, fraud.
Additional Divinatory Meanings
A visit from a friend, who will bring unexpected money to the Querent.
Additional Meanings – Reversed
By S. L. MacGregor Mathers, c 1888
Knight of Cups
Knight of Cups – Arrival, Approach, Advance.
Divinatory Meanings – Reversed
Duplicity, Abuse of Confidence, Fraud, Cunning.
General Book of the Tarot
By A. E. Thierens, 
Knight of Cups
“The higher graces of the imagination” (Waite). Arrival, approach, advances, proposition, demeanour, invitation, incitement, reception, comparison. Reversed: Trickery, fraud, duplicity, subtlety, swindle, artifice.
The Water of the soul on the Twelfth and on the Eighth house. The double influence of water makes the emotions and feelings prominent, relates to the imagination, to deeper experiences and strong reactions of the soul, processes of psychic life, which may end in wonderful success or in less desirable phenomena. It is sure to indicate much relating to the subways of human life and the human soul. This is not always favourable or pleasant, of course, but is in almost every instance intensive, though the cups never go to anything like hatred or crime or real malice. Their weakness is in being unreliable or incalculable with regard to things of the exact world or matter. So in the worst cases this card may indicate everything connected with swindling from sheer mental instability. But it may also be, that the term ‘swindler’ (charlatan) is wrongly given to people who are standing apart from the common herd and are more or less occultists. The “higher graces of the imagination.”
There may be certainly a considerable degree of falsehood expressed by this card: false interpretation, misjudgment, tendencious or fantastic narratives, exaggerated complaints, imaginary wrongs, pathos and what the world calls miscarriage. On account of the eighth house all this may be connected with sex-questions or intimate and private affairs. The card may express indiscretion committed and slanderous reports, secretly promulgated. It has to do with secrets and the divulgation of secrets. But there may be also a higher sway in the emotional realm: devotion, sacrifice, charity.
The Oracle of the Tarot – Exoteric Tarot
By Paul Foster Case (1933)
Knight of Cups
The swastika in the vesica is a symbol of good fortune.
From the beginning of the last decanate of Aquarius to the end of the second decanate of Pisces, February 9th to March 10th, under the rulerships of Venus, Jupiter-Neptune, and Moon.
He is a graceful, somewhat indolent personality, generous and enthusiastic, if he can be really interested. Somewhat impressionable and psychic. Fond of home, and probably puts all women more or less on a pedestal. Friendly to Querant. If Ill-dignified, lazy, untruthful, very likely effeminate and more or less “catty.”
Brown hair. Gray or brown eyes.
More information on the Knight of Cups Tarot card.