Business and work quotes

As quoted in The Military Quotation Book (2002) by James Charlton, p. 93
Attributed

This quotation, often attributed on the Internet to Plato, cannot be found in any of Plato's writings, nor can it be found in any published work anywhere until recent years. If it really were a quotation by Plato, then some author in the recorded literature of the last several centuries would have mentioned that quote, but they did not. The sentiment isn't new, however. The ancient Roman Seneca, in his work on "Morals," quoted an earlier Roman writer, Lucretius (who wrote about the year 50 B.C.), as saying "we are as much afraid in the light as children in the dark." (Seneca was paraphrasing a longer passage by Lucretius from De Rerum Natura (On the Nature of Things), Book II, lines 56 et seq.)
Misattributed

Attributed to Plato in No Ordinary Moments: A Peaceful Warrior's Guide to Daily Life (1992) by Dan Millman. It has also been wrongly attributed to Philo. It is a variant of the Christmas message "Be pitiful, for every man is fighting a hard battle," written by the Scottish preacher Ian Maclaren (also known as John Watson) in 1897.
Be Kind; Everyone You Meet is Fighting a Hard Battle. Plato? Philo of Alexandria? http://quoteinvestigator.com/2010/06/29/be-kind/
Misattributed

1900s, A Square Deal (1903)
Context: Among ourselves we differ in many qualities of body, head, and heart; we are unequally developed, mentally as well as physically. But each of us has the right to ask that he shall be protected from wrong-doing as he does his work and carries his burden through life. No man needs sympathy because he has to work, because he has a burden to carry. Far and away the best prize that life offers is the chance to work hard at work worth doing; and this is a prize open to every man, for there can be no better worth doing than that done to keep in health and comfort and with reasonable advantages those immediately dependent upon the husband, the father, or the son. There is no room in our healthy American life for the mere idler, for the man or the woman whose object it is throughout life to shirk the duties which life ought to bring. Life can mean nothing worth meaning, unless its prime aim is the doing of duty, the achievement of results worth achieving.

Variant: Look Toward the stars but keep your feet firmly on the ground.
Source: The Greatest American President: The Autobiography of Theodore Roosevelt

Variant: No one cares how much you know, until they know how much you care

1900s, The Strenuous Life: Essays and Addresses (1900), The Strenuous Life
Context: It is hard to fail, but it is worse never to have tried to succeed. In this life we get nothing save by effort. Freedom from effort in the present merely means that there has been stored up effort in the past.
Context: A life of slothful ease, a life of that peace which springs merely from lack either of desire or of power to strive after great things, is as little worthy of a nation as of an individual. [... ] If you are rich and are worth your salt, you will teach your sons that though they may have leisure, it is not to be spent in idleness; for wisely used leisure merely means that those who possess it, being free from the necessity of working for their livelihood, are all the more bound to carry on some kind of non-remunerative work in science, in letters, in art, in exploration, in historical research—work of the type we most need in this country, the successful carrying out of which reflects most honor upon the nation. We do not admire the man of timid peace. We admire the man who embodies victorious effort; the man who never wrongs his neighbor, who is prompt to help a friend, but who has those virile qualities necessary to win in the stern strife of actual life. It is hard to fail, but it is worse never to have tried to succeed. In this life we get nothing save by effort. Freedom from effort in the present merely means that there has been stored up effort in the past. A man can be freed from the necessity of work only by the fact that he or his fathers before him have worked to good purpose. If the freedom thus purchased is used aright, and the man still does actual work, though of a different kind, whether as a writer or a general, whether in the field of politics or in the field of exploration and adventure, he shows he deserves his good fortune. But if he treats this period of freedom from the need of actual labor as a period, not of preparation, but of mere enjoyment, even though perhaps not of vicious enjoyment, he shows that he is simply a cumberer of the earth's surface, and he surely unfits himself to hold his own with his fellows if the need to do so should again arise.