“What maintains the marriage and what is it? Only the knowledge of the hearts, that is its beginning and end.”
Paracelsus - Doctor of our Time (1992)
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Paracelsus 24
Swiss physician and alchemist 1493–1541Related quotes

“Love is a wonderful game which begins in fun and ends in marriage.”
Source: The 10th Victim (1965), Chapter 15 (p. 131)

“Knowledge of what is possible is the beginning of happiness.”

“Where knowledge ends, religion begins.”
Remark, attributed in John Gordon Stewart Drysdale and John James Drysdale, The Protoplasmic Theory of Life (1874), p. 279 (note).
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Youtube, Other, Biblical Family Values https://www.youtube.com/watch?v=bldw8X5apnY (July 11, 2015)

“A loving heart is the beginning of all knowledge.”
Article on Biography.
1820s, Critical and Miscellaneous Essays (1827–1855)
Variant: For love is ever the beginning of Knowledge, as fire is of light.

“A falsehood in which some truth is not stated at the beginning, cannot be maintained in the end.”
Deuteronomy 13,27
Ethics

“Knowledge of human nature is the beginning and end of political education.”
The Education of Henry Adams (1907)