In order to know whether a ...

In order to know whether a human being is young or old, offer it food of different kinds at short intervals. If young, it will eat anything at any hour of the day or night.
In order to know whether a human being is young or old, offer it food of different kinds at short intervals. If young, it will eat anything at any hour of the day or night.
 Oliver Wendell Holmes, Jr.

More phrases

Being self-made is a state of mind, and once you put that mentality to work, your success will come.
 Dave East
A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
 Dave East
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
Don't settle in the land of barely enough. That is where you are, it is not who you are. That's your location, it's not your identity. No matter what it looks like, have an abundant mentality.
Everything in your life, every experience, every relationship is a mirror of the mental pattern that is going on inside of you.

Quotes from the same author

What I wouldn't give to be seventy again!
 Oliver Wendell Holmes, Jr.
Many ideas grow better when transplanted into another mind than in the one where they sprung up.
 Oliver Wendell Holmes, Jr.
Be willing to commit yourself to a course, perhaps a long and hard one, without being able to foresee exactly where you will come out.
 Oliver Wendell Holmes, Jr.
With all humility, I think, "Whatsoever thy hand findeth to do, do it with thy might." Infinitely more important than the vain attempt to love one's neighbor as one's self. If you want to hit a bird on the wing you must have all your will in focus, you must not be thinking about yourself, and equally, you must not be thinking about your neighbor; you must be living with your eye on that bird. Every achievement is a bird on the wing.
 Oliver Wendell Holmes, Jr.
Science is the topography of ignorance. From a few elevated points we triangulate vast spaces, inclosing infinite unknown details. We cast the lead, and draw up a little sand from abysses we may never reach with our dredges.
 Oliver Wendell Holmes, Jr.