Learning about the world is the sole reason for human existence. We're given this glorious puzzle box when we're born, and we need to figure out as much of it as we can before we kick off. To satisfy this purpose, humanity has developed a whole shedload of cool specialty tools.
Hundreds of years ago, there were a lot fewer tools. You didn't have to know so much, and the chance that you would invent the electromagnet, or discover a new kind of onion, was pretty good. Now, there's still lots of things we haven't figured out, but because it hasn't happened yet, we don't know what they will be. Did that make sense? What I am trying to say is: you need to buy some more tools, because the best kind of tools are the tools that make tools. Took me long enough to get to the point, right?
When you're a teenager, you might think that you're hot stuff figuring out the two-wrenches trick. As an adult, you teach yourself to MIG together two chunks of iron, and then build terrifying race cars. You still have a lot of money, space, and time to get to the point where you're running half of an industrial machining operation just to turn down an oil filter socket so that it fits over your friend's aftermarket valve cover. Such is a life well spent.
Head on out to the garage right now and figure out what tool you're missing. Maybe you can invent it yourself, and then it will forever be named after you. Just let me have a free one, so I can put it on the shelf with all the other specialty tools that I won't use instead of a hammer and profanity.