Agree. If you only save money, you won't be able to increase your capital over time. What's worse is that your saved money will tend to depreciate in value as time goes by, leaving you will less spending power than before.
But if you're wise and want your capital to grow, you should invest your hard earned money into bonds, stocks, or commodities for the long term. Gold is an ideal store of value for this purpose, and will make your investment grow the scarcer and valuable it gets. Also, you can depend on Bitcoin to grow your capital, as the pioneer cryptocurrency has a deflationary model and limited supply with potential for growth over time.
Besides these two mentioned commodities or assets, there are many other options for you to choose from, that will help make your capital expand towards having a better financial life in the future. It is up to you to make the right decisions with your money, to ensure your wealth and avoid becoming bankrupt in the future. Just my opinion.