ACTUALLY......
The Bible don'ts say that. Anywhere. At all. That would be a quote from Shakespear. (or however you spell it).
THE BIBLE says to be true to YHVH (G-D) and to be true to His commandments. According to the teachings in the Word of Yahweh, being 'true to yourself' is a form of self worship, and as such, is idolatry. Why? because in being true to yourself istead of YHVH, you are putting yourself over YHVH... and anything put above YHVH is an idol.
To answer your question, to be true to yourself would mean to be loyal only to what you want, and what you think and not about others or about YHVH God.
That quote is not from the Bible; it's from Shakespeare's Hamlet, Act 1, Scene 3, Lines 78-81. Polonius is speaking to his son, Laertes.
"This above all: to thine own self be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.
Farewell, my blessing season this in thee!"
The line is from Shakespeare (Hamlet I iii): This above all: to thine own self be true/ And it must follow, as the night the day,/ Thou canst not then be false to any man.
Francis Bacon expresses the idea also, in Of Wisdom for a Man's Self: Be so true to thyself, as thou be not false to others.
"This above all: to thine own self be true,/And it must follow, as the night the day,/Thou cans't not be false to any man " --- Shakespeare in his play Hamlet
The quote "To thine own self be true" was written by Shakespeare. This appears in a speech by Polonius in Hamlet. This is NOT in the Bible.
This line is spoken by Polonius in William Shakespeare's play "Hamlet." He gives this advice to his son, Laertes, before he departs for France. The quote emphasizes the importance of being honest and true to oneself, and warns against getting involved in lending or borrowing money, which can lead to troubles.
Thine Own Self was created on 1994-02-14.
In the quotation 'To thine own self be true' thine is used for the word 'your'. It says 'Be true to yourself'.
Translating to contemporary English "Be true to yourself."
Summerland - 2004 To Thine Self Be True 1-7 is rated/received certificates of: Argentina:13
Grammar. "Thine" is used before a word beginning with a vowel (like the difference between "a" and "an"). Shakespeare wrote "thine," of course. (Elizabethan grammar was a flexible thing, but not in this case.)
Sons of Anarchy - 2008 To Thine Own Self 5-11 was released on: USA: 20 November 2012
Frasier - 1993 To Thine Old Self Be True 7-20 is rated/received certificates of: Canada:PG (video rating)
90210 - 2008 To Thine Own Self Be True 2-10 is rated/received certificates of: Netherlands:6 USA:TV-14
Season 1 episode 7 it is called "to thine self be true"
He's showing his true colors. To thine own self be true.