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.
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.
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
This Bible verse teaches us to focus on our own faults before judging others. It emphasizes the importance of self-reflection and humility in recognizing our own shortcomings before pointing out those of others.
Season 1 episode 7 it is called "to thine self be true"
"The truth is rarely pure and never simple." Oscar Wilde ANSWER #2 The ancient Greek philosopher, Socrates, is attributed with saying: "To thine own self be true."This very short expression was many centuries later expanded on by Shakespeare in his tragedy, "Hamlet". Both Socrates and Shakespeare express the notion that knowing oneself first is the key to truth. I have paraphrased Shakespeare's full quote from "Hamlet" as follows: 'This above all: To thine own self be true, for it must follow as night follows day that you cannot be false to any man.'