“For human beings, there is no difficulty that cannot be overcome. Rely on yourself, and you can overcome anything.”

As quoted during the 13th Organization of Islamic Cooperation (OIC) Summit in Istanbul, in "Islamic leaders pledge to combat sectarianism" http://www.aljazeera.com/news/2016/04/islamic-leaders-pledge-combat-sectarianism-160415185615217.html, Al Jazeera (April 15, 2016)

Quotes, Concession speech (2000)
Context: I know that many of my supporters are disappointed. I am too. But our disappointment must be overcome by our love of country.
And I say to our fellow members of the world community, let no one see this contest as a sign of American weakness. The strength of American democracy is shown most clearly through the difficulties it can overcome.

Source: 1930s-1951, Philosophical Occasions 1912-1951 (1993), Ch. 9 : Philosophy (chapters 86–93 of the so called Big Typescript), p. 161
Corresponding to TS 213, Kapitel 86
Context: What makes a subject difficult to understand — if it is significant, important — is not that some special instruction about abstruse things is necessary to understand it. Rather it is the contrast between the understanding of the subject and what most people want to see. Because of this the very things that are most obvious can become the most difficult to understand. What has to be overcome is not difficulty of the intellect but of the will. [Nicht eine Schwierigkeit des Verstandes, sondern des Willens ist zu überwinden. ]

Quoted in Shackleton (2013) by Roland Huntford https://books.google.cl/books?id=U6MNkTbRwtwC&pg=PT250&lpg=PT250&dq=Difficulties+are+just+things+to+overcome+after+all&source=bl&ots=3gWt7QcL43&sig=y5CzkBvxAdWC7MlWA3eP1eNkpDs&hl=en&sa=X&redir_esc=y#v=onepage&q=Difficulties%20are%20just%20things%20to%20overcome%20after%20all&f=false

Speech for the "Make Poverty History" campaign http://news.bbc.co.uk/2/hi/uk_news/politics/4232603.stm. Trafalgar Square, London (3 February 2005).
2000s
Context: Like slavery and apartheid, poverty is not natural. It is man-made and it can be overcome and eradicated by the actions of human beings. And overcoming poverty is not a gesture of charity. It is an act of justice. It is the protection of a fundamental human right, the right to dignity and a decent life. While poverty persists, there is no true freedom.

p. 640

Source: A Dictionary of Thoughts, 1891, p. 26.