The phrase "and the highest principles" is correct and usable in written English.
You can use it when discussing values, ethics, or standards that are considered to be of the utmost importance.
Example: "In our organization, we strive to operate with integrity and the highest principles in all our dealings."
Alternatives: "and the utmost standards" or "and the most esteemed values".
I pledge the rest of my journalistic career to making this terrible incident an exception, to working to regain your trust, and to exemplifying and following the highest principles of independent journalism, to which I am devoted and you are entitled.
"Even if this was unlikely to occur, the need to protect the integrity of outcome - and uphold the highest principles of fair play - may be considered crucial at a time of alleged football match-fixing in various countries".
Booth had a reputation for walking when he knew that he was out, without waiting for the umpire's decision, and he was regarded as a player and leader of the highest principles.
He will be remembered above all as a warm, loving and humorous family man, a cherished colleague, a loyal and generous friend, and a man of the highest principles.
Yet the war should be waged only against the Confederate Army and leadership, according to "the highest principles known to Christian Civilization" — in other words, the Union must not interfere with slavery, and the owners of any confiscated "contraband" must be compensated.
While the myriad issues facing the U.S. have changed and changed again since Kennedy's time, the importance of being guided by the highest principles and ideals has not.
On the contrary, its task is to discover and establish the highest principle(s) of rational understanding, and thereby the principles not only of the sciences, but also of ethics and aesthetics, in short, of all the domains of human culture.[32] It must however take science as its primary object of inquiry because science represents the paradigm of knowing (Erkenntnis).
