Tact is the knack of making a point without making an enemy

Thumbnail of Isaac Newton
Tact is the knack of making a point without making an enemy.

Isaac Newton

January 4, 1643 – March 31, 1727
Sir Isaac Newton was an English mathematician, physicist, astronomer, theologian, and author (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time, and a key figure in the scientific revolution.