This quote by Aesop talks to the concept that it is a lot easier to be brave when one is not in direct threat. It is simple to discuss being brave and brave when one is not in a circumstance that requires them to be brave. It is much more difficult to be brave when one is in a dangerous circumstance and needs to deal with the consequences of their actions. This quote is a tip that bravery is not something that can be ignored and that it needs a lot of guts to deal with danger head on. It is simple to be brave from a safe range, however it takes a special kind of nerve to be brave when one remains in the middle of threat.
"Nature gives to every time and season some beauties of its own; and from morning to night, as from the cradle to the grave, it is but a succession of changes so gentle and easy that we can scarcely mark their progress"