Every man naturally persuades himself that he can keep his resolutions, nor is he convinced of his imbecility but by length of time and frequency of … - Samuel Johnson

The distance is commonly very great between actual performances and speculative possibility. It is natural to suppose, that as much as has been done to-day may be done to-morrow; but on the morrow some difficulty emerges or some external impediment obstructs. Indolence, interruption, business, and pleasure; all take their turns of retardation; and every long work is lengthened by a thousand causes that can, and ten thousand that cannot, be recounted. Perhaps no extensive and multifarious performance was ever effected within the term originally fixed in the undertaker's mind. He that runs against Time, has an antagonist not subject to casualties.

From Samuel Johnson's Lives of the Poets series, published in 3 volumes between 1779 and 1781, on Alexander Pope

Let Observation with extensive View,
Survey Mankind, from China to Peru;
Remark each anxious Toil, each eager strife,
And watch the busy Scenes of crowded Life;
Then say how Hope and Fear, Desire and Hate,
O'erspread with Snares the clouded Maze of Fate,
Where wav'ring Man, betray'd by vent'rous Pride,
To tread the dreary Paths without a Guide;
As treach'rous Phantoms in the Mist delude,
Shuns fancied Ills, or chases airy Good.
How rarely Reason guides the stubborn Choice,
Rules the bold Hand, or prompts the suppliant Voice,
How Nations sink, by darling Schemes oppress'd,
When Vengeance listens to the Fool's Request.
Fate wings with ev'ry Wish th' afflictive Dart,
Each Gift of Nature, each Grace of Art,
With fatal Heat impetuous Courage glows,
With fatal Sweetness Elocution flows,
Impeachment stops the Speaker's pow'rful Breath,
And restless Fire precipitates on Death.

A fellow that makes no figure in company, and has a mind as narrow as the neck of a vinegar-cruet.