AN ARIA (always remembered instructor's advice - or admonition ) -
"The only time you were on track was when you were crossing it!"
"That compass is good for only one thing. It'll tell us whether we are
pointing straight ahead."
The late Harry Purvis (he flew with the RAAF in the war and before that with Kingsford Smith and after with PG Taylor) used to say after every landing "Got away with it again."
not exactly a truism but worth the repeating .. . . the KLM 747 skipper who was told by approach that he appeared to be slightly left of the localiser - (strong Dutch accent ) - 'Yes . That is correct. And my first officer is slightly to the right of it."