This above all:to thine own self be true意思

"This above all: to thine own self be true" is a line from Shakespeare's play "Hamlet." It is spoken by Polonius, an advisor to the king of Denmark, as advice to his son Laertes before Laertes goes to study in Paris. The line is part of a longer speech in which Polonius gives his son advice on how to conduct himself in the world.

The meaning of the line is that it is most important to be true to oneself, to be honest with oneself about who one is and what one believes. This is seen as the foundation for being honest and true to others. Polonius is telling his son that it is important to have integrity and to live according to one's own values and beliefs, rather than pretending to be someone else or living according to the expectations of others.

The line has been widely quoted and is still relevant today as a reminder of the importance of honesty and integrity in one's personal and professional life.