“All time is wasted that is not spent in seeking God.”
This adage is attributed to the ancient sage Sukdeva, as quoted in Promise of Immortality: The True Teaching of the Bible and the Bhagavad Gita (2001) by J. Donald Walters. p. 242
Disputed
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Lahiri Mahasaya 5
Indian yogi and guru 1828–1895Related quotes

“Time spent with cats is never wasted.”
Frequently attributed to Freud, but there is no evidence Freud ever said it http://www.freud.org.uk/about/faq/.
Misattributed

“Time spent arguing with the faithful is, oddly enough, almost never wasted.”
Source: 2000s, 2001, Letters to a Young Contrarian (2001)

"Good And Bad Procrastination", December 2005