Source: What I Know For Sure
“If "thank you" is the only prayer you can utter in your lifetime, that would be enough.”
Very commonly attributed to Eckhart on the internet and some publications, the source of the first formulation however is: A Bucket of Surprises (2002) by J. John and Mark Stibbe.
Disputed
“If the only prayer you said was thank you, that would be enough.”
Very commonly attributed to Eckhart on the internet and some publications, but the earliest source yet located is A Bucket of Surprises (2002) by J. John and Mark Stibbe Variants: If "thank you" is the only prayer you can utter in your lifetime, that would be enough.
Disputed
Variant: If the only prayer you said in your whole life was, "thank you," that would suffice.
“If you only utter a single prayer in this life let it be Thanks, with all your heart”
All Will be Well (2004)
“When you say your prayers try to understand”
Music, Cross Road (1994)
U.S. Grant's "perfect speech" which he used on several occasions beginning in 1865, as quoted in Grant: A Biography (1982) by William S. McFeely, p. 234
1860s
