What does the statement Rome wasn't build in a day mean?

there are many things in the world which take a long time to mature.it is the

nature of task which would take time to be accomplished.some people are in the habit of getting impatient when a task takes a long time to complete.they do not understand or forget the nature of task and start losing heart.this proverb means-things cannot be done overnight,we need long time ,patience and continuous effort for aiming our success.