If the only prayer you said in your whole life was, "Thank You," that would suffice.

"If the only prayer you say throughout your life is "Thank You," then that will be enough."

"If the only prayer you ever say in your whole life is "thank you," it will be enough."

If the only prayer you ever say in your entire life is 'Thank you,' it will be enough.

If the only prayer you ever say in your entire life is thank you, it will be enough.

If the only prayer you said was thank you, that would be enough.

Variant: If "thank you" is the only prayer you can utter in your lifetime, that would be enough.

If the only prayer you say in your entire life is 'thank you,' that will be enough. ~ Meister Eckhart

If the only prayer you said in your whole life was “thank you,” that would be sufficient. — MEISTER ECKHART

If the only prayer you ever say in your entire life is ‘Thank you,’ it will be enough.” — Meister Eckhart

If you only utter a single prayer in this life let it be Thanks, with all your heart

The only thing really worth praying for is Truth.

"When complimented, a sincere "thank you" is the only response required."

I have now concentrated all my prayers into one, and that one prayer is this, that I may die to self, and live wholly to Him.