What does this quote mean the problem with doing nothingis not knowing when you are finished?

This quote means that when you do nothing, you don't have a clear goal or end point, so you never know when you have achieved what you set out to do. This can lead to a sense of aimlessness and dissatisfaction, as you may feel like you're constantly working without ever making any real progress. Additionally, by not taking action, you miss out on the opportunity to learn and grow from your experiences, which can prevent you from reaching your full potential.