Life is a juggling acting, where the balls are made of rubber or glass. In other words, some will bounce back if you drop them and others will shatter. So, it's important to know which are which. Typically, professional activities and money are fixable, while broken relationships and health problems are difficult to repair once neglected. Since we're prone to dropping a ball or two the more we juggle, it's prudent to think carefully about whether adding another ball is a good idea.
Without a clear sense of what's non-negotiable, it's easy to rationalize adding just one more thing. Taking stock of your glass balls makes setting personal priorities relatively simple. Are you willing to bear the added risk of dropping a glass ball? And, if you accidentally take on too much, which balls are you willing to let drop?