spirit vs. spirits

HI, can any body tell me the difference between ‘spirit’ and ‘spirits’. While writing ‘hope this letter finds you in the best of your health and spirit or spirits’. Thanks.

“In good spirits” is the expression you need there.

Hello Vish, welcome to English Test.

“In the best of health and spirits” would be suitable there.

Your “spirits” = your “mood”.

Best wishes,

MrP

Here are two common expressions:

to be in good spirits
to act in good spirit

The singular form of spirit is used in various contexts such as the brand name of Coca Cola’s new soft drink The Spirit of Georgia.[YSaerTTEW443543]

TOEIC listening, photographs: Loading the car[YSaerTTEW443543]

And here www.theholyspirit.com