Tact is as important in manners as in speech. The word is closely allied to the word touch, and a person who has good tact is really one who can touch people gently, carefully, kindly, in all the relations of life. In the animal creation no creature has more perfect tact than a well-bred, kindly-treated household cat. You may have seen one of these enter a room where perhaps a circle of people were seated around a stove or open fire. Puss wants her warm place in front of the fire or stove, but she does not brusquely and rudely push her way there. No. She glides gently, purringly around the circle, rubs caressingly against this one and that, as though gently saying, "By your leave"; and when finally she reaches the desired spot, she lays herself down so gracefully and quietly and curls herself up so deftly that to witness the act really affords pleasure to the observer. A creature of less tact and grace would only appear obtrusive and offend and antagonize the company, and probably rightfully receive reproof and be ejected from the room.
Behind the best tact lies the wish to be kind and to make people comfortable and happy, to avoid wounding and irritating; and so it is true that the basis of true tact is, after all, the moral sentiment.
The Charm of Fine Manners by Mrs. Helen Ekin Starrett