I see investing and speculating as "symmetrical" opposites of each other that share the same goal, namely, making a profit.

Investing contains a component of speculating, and speculating contains a component of investing. The main emphasis in investing is on the value of the assets underlying the investment with the expectation that it will create a desired return (i.e., profit), and less emphasis on the price fluctuations (which is the speculative component).

On the other hand, the main emphasis in speculating is on the price fluctuations with the expectation that it will create a desired return (i.e., profit), and less emphasis on the value of the assets.