Improvement is the process of a thing moving from one state to a state considered to be better, usually through some action intended to bring about that better state. The concept of improvement is important to governments and businesses, as well as to individuals.
Safety is the state of being "safe" (from French sauf), the condition of being protected from harm or other non-desirable outcomes. Safety can also refer to the control of recognized hazards in order to achieve an acceptable level of risk.
For if you think that by killing men you can avoid the accuser censoring your lives, you are mistaken; that is not a way of escape which is either possible or honorable; the easiest and the noblest way is not to be crushing others, but to be improving yourselves.
Socrates, Plato's account of the trial of Socrates in Apology. (Translated by Benjamin Jowett.) 39c–d
So cheat your landlord if you can and must, but do not try to shortchange the Muse. It cannot be done. You can't fake quality any more than you can fake a good meal.
William S. Burroughs, The Western Lands, ch. 2 (1987).