Not everything is always positive, along with good results, we have to accept negative results, profit does not always come, and loss does not mean failure. Rather, we have to maintain a balance between the two and accept both as normal and continue research to improve ourselves more. Basically, we have to make ourselves more efficient through failure, and for this, we should not see failures as weaknesses but as inspiration to learn more, then we will continue to learn more, which will increase our knowledge more, which will later help us make more effective decisions.
Normally, there is no business or investment that doesn't involve both profit and loss, but just as you said its about finding balance, which will be important in people lives if they actually learn from their mistakes or from their losses, as its a stepping stone to successful investment or for growth.
But, most people find it hard to accept failure, as their mindset is only based on winning and profit, that is why its better to view their investment in two ways, which is profit and loss because not everyday is a winning day, the earlier people accept that, the best for them.