Source: The Political Economy of International Relations (1987), Chapter One, Nature of Political Economy, p. 23
“There is no power on earth, that can neutralize the influence of a high, pure, simple and useful life.”
"The Virtue of Simplicity," from Character Building: Being Addresses Delivered on Sunday Evenings to the Students of Tuskegee Institute (1902), p. 41 http://books.google.com/books?vid=0xSIrRTbnYkF0PDougzpPqX&id=DYYMAAAAIAAJ&pg=PP9&lpg=PP9&dq=%22Character+Building:+Being+Addresses+Delivered%22#PPA41,M1
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Booker T. Washington 48
African-American educator, author, orator, and advisor 1856–1915Related quotes
Attributed to Selznick in: Kobi Yamada, Dan Zadra, Steve Potter (2003), Everyone Leads,

1900s, The Moral Equivalent of War (1906)
Context: Alexander's career was piracy pure and simple, nothing but an orgy of power and plunder, made romantic by the character of the hero. There was no rational purpose in it, and the moment he died his generals and governors attacked one another.

“Influence can persuade, but power can compel.”
This has been cited as being from Politics Among Nations in ¿«Armas de convicción masiva»? American Studies durante la guerra fría: el casa Español (2010) by Francisco Javier Rodríguez Jiménez, p. 1, but has not been located in any English editions of the work and may be a back-translation or paraphrase of a statement within a Spanish edition.
Disputed

“The divine is not something high above us. It is in heaven, it is in earth, it is inside us”

Speech at the National Press Club (2004)

Meher Baba’s Call (1954)
Context: Be pure and simple, and love all because all are one. Live a sincere life; be natural, and be honest with yourself.
Honesty will guard you against false modesty and will give you the strength of true humility. Spare no pains to help others. Seek no other reward than the gift of Divine Love.

Thought and Word, i
The Note-Books of Samuel Butler (1912), Part VII - On the Making of Music, Pictures, and Books