Personally my principles in life are simple;
Learn, grow and live right.
Every opportunity should be seen as one to learn and every opportunity to learn should be welcomed and explored.
On growth, our growth should be very important to us; it should be guarded jealously and monitored closely.
On living right, this entails everything that would make you a righteous person; being kind, being truthful etc. It also involves taking care of oneself and soul, eating right, maintaining a healthy lifestyle and taking time off to play with loved ones etc.