
“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.