“If a warrior is to succeed in anything, the success must come gently, with a great deal of effort but with no stress or obsession.”

Source: Success! (1977), p. 284; a portion of this — "In order to succeed we must first believe that we can" — has become widely attributed to Nikos Kazantzakis on the internet, but without citation of any sources.
Context: The American system demands success, and in order to succeed we must first believe that we can. Yet our society, with its intolerance of failure and poverty, traps millions of people in positions where any kind of success seems impossible to contemplate, and in which failure itself is a kind of passive rebellion against their own misery and the social system which created it in the first place.
To succeed it is necessary to accept the world as it is and rise above it.

"The Erring" (1844).
Context: Speak kindly to the erring;
Thou yet may'st lead them back,
With holy words and tones of love,
From misery's thorny track.
Forget not thou hast often sinned.
And sinful yet must be;
Deal gently with the erring one,
As God hath dealt with thee.

The art of positive thinking. http://www.storypick.com/quotes-by-tendulkar/

Source: Reengineering the Corporation, 1993, p. 200

Source: Kama Sutra, p. 69

Mathematical Methods in Science (1977), p.161

Rien ne réussit comme le succès. <br class="br">Ange Pitou, Vol. 1 chapter 7 http://www.dumaspere.com/pages/biblio/chapitre.php?lid=r3&amp;cid=7 (1854).

Source: 1970s, Organizational Analysis: A Sociological View, 1970, p. 52