“Who can know heaven except by its gifts? and who can find out God, unless the man who is himself an emanation from God?”
Astronomica
Original
Quis cœlum possit nisi cœli munere nosse? Et reperire deum nisi qui pars ipse deorum est?
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Marcus Manilius 18
Roman writerRelated quotes

The Way of God's Will Chapter 1-8. Kingdom of Heaven http://www.unification.org/ucbooks/WofGW/wogw1-08.htm Translated 1980.
“No man loveth God except the man who has first learned that God loves him.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 398.

“A man who, beyond the age of 26, finds himself on a bus can count himself as a failure.”
Attributed to her in Commons debates, 2003-07-02, column 407 http://www.parliament.the-stationery-office.co.uk/pa/cm200203/cmhansrd/vo030702/debtext/30702-10.htm and Commons debates, 2004-06-15 column 697 http://www.publications.parliament.uk/pa/cm200304/cmhansrd/vo040615/debtext/40615-20.htm#40615-20_spnew1. According to a letter http://www.telegraph.co.uk/core/Content/displayPrintable.jhtml?xml=/opinion/2006/11/02/nosplit/dt0201.xml&site=15&page=0 to the Daily Telegraph by Alistair Cooke on 2 November 2006, this sentiment originated with Loelia Ponsonby, one of the wives of 2nd Duke of Westminster who said "Anybody seen in a bus over the age of 30 has been a failure in life". In a letter http://www.telegraph.co.uk/comment/letters/3633852/Letters-to-the-Daily-Telegraph.html published the next day, also in the Daily Telegraph, Hugo Vickers claims Loelia Ponsonby admitted to him that she had borrowed it from Brian Howard. There is no solid evidence that Margaret Thatcher ever quoted this statement with approval, or indeed shared the sentiment.
Misattributed

Muhammad Kulayni, Usūl al-Kāfī, vol.1, p. 23.
Religious Wisdom

“Unless one always speaks the truth, one cannot find God Who is the soul of truth.”
Source: Sayings of Sri Ramakrishna (1960), p. 531

As quoted in Mathematics, Education and Philosophy: An International Perspective (1994) by Paul Ernest
This has also been quoted or misquoted as "There lives no man upon the earth who can give a final judgement upon what the most beautiful shape of man might be; God only knows that".

As quoted in Reader's Digest (July 1972)

“God withholds Himself from no one who perseveres.”