To acquire knowledge, one must study; but to acquire wisdom, one must observe.

Good, better, best. Never let it rest. 'Til your good is better and your better is best.

If you're going through hell, keep going.

I have not failed. I've just found 10,000 ways that won't work.

In general contexts, speculate means "to form ideas or theories about something usually when there are many things not known about it." In contexts relating to business or finance, it means "to invest money in ways that could produce a large profit but that also involve a lot of risk."

// Scientists speculate that the newly discovered exoplanet could host liquid water.

// Their research explores the implications of so many people speculating on the stock market in the years leading up to the Great Depression.

If you change the way you look at things, the things you look at change.

The best advice I ever got was that knowledge is power and to keep reading.

Put your heart, mind, and soul into even your smallest acts. This is the secret of success.

All wish to possess knowledge, but few, comparatively speaking, are willing to pay the price.

Thought is the wind, knowledge the sail, and mankind the vessel.