“This is my belief: that through difficulties and problems God gives us the opportunity to grow. So when your hopes and dreams and goals are dashed, search among the wreckage, you may find a golden opportunity hidden in the ruins.”
Source: Wings of Fire, p. 140.
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A. P. J. Abdul Kalam 43
11th President of India, scientist and science administrator 1931–2015Related quotes

“Difficulties give us the opportunity to prove our greatness by overcoming them.”
Message dictated to Sanjeeva Reddy at Guruprasad (6 June 1960), as quoted in The God-Man : The Life, Journeys and Work of Meher Baba with an Interpretation of His Silence and Spiritual Teaching (1964) by Charles Benjamin Purdom, p. 353 <!-- also quoted in The Silent Master : Meher Baba, Avatar of the Age (1987), by Irwin Luck, p. 15 -->
General sources
Context: It is better to deny God, than to defy God.
Sometimes our weakness is considered strength, and we take delight in borrowed greatness.
To profess to be a lover of God and then to be dishonest to God, to the world and to himself, is unparalleled hypocrisy. Difficulties give us the opportunity to prove our greatness by overcoming them.

On the virtues of giving - "Hope Awakens For Forsaken" http://www.modernghana.com/news/237288/1/hope-awakens-for-forsaken.html Modern Ghana (September 9 2009)

Ellen on Oprah show, 9th of November 2009

“You are successful and creative only when you see an opportunity in every difficulty.”
Quotations from Gurudev’s teachings, Chinmya Mission Chicago

This quote is commonly attributed to Churchill, but appears in the "Red Herrings: False Attributions" appendix of Churchill by Himself : The Definitive Collection of Quotations (2008) by Richard Langworth, without citation as to where it originates.
In American Character, a 1905 address by Brander Matthews, a similar quotation is attributed to L. P. Jacks ( link http://hdl.handle.net/2027/mdp.39015059451156?urlappend=%3Bseq=238).
""Our civilization is a perilous adventure for an uncertain prize... Human society is not a constructed thing but a human organization... We are adopting a false method of reform when we begin by operations that weaken society, either morally or materially, by lower its vitality, by plunging it into gloom and despair about itself, by inducing the atmosphere of the sick-room, and then when its courage and resources are at a low ebb, expecting it to perform some mighty feat of self-reformation... Social despair or bitterness does not get us anywhere... Low spirits are an intellectual luxury. An optimist is one who sees an opportunity in every difficulty. A pessimist is one who sees a difficulty in every opportunity... The conquest of great difficulties is the glory of human nature." L. P. Jacks, quoted in American character, by Brander Matthews, 1906
Misattributed
Variant: A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

Variant: Three Rules of Work:
Out of clutter find simplicity.
From discord find harmony.
In the middle of difficulty lies opportunity.
Source: The Quotable Einstein

Inauguration of Library of Birmingham, Jan 2013