Whatever you find to do with your hands, do it with all your might, for in Sheol, where you are going, there is no work or planning or knowledge or wisdom.
Whatever one's hand finds to do should be done with full might, because death ends earthly work and planning.
This verse joins joyful reception to diligent action.
7Go, eat your bread with joy, and drink your wine with a cheerful heart, for God has already approved your works: 8Let your garments always be white, 9Enjoy life with your beloved wife all the days of the fleeting life that God has given you under the sun — all your fleeting days. For this is your portion in life and in your labor under the sun. 10Whatever you find to do with your hands, do it with all your might, for in Sheol, where you are going, there is no work or planning or knowledge or wisdom. 11I saw something else under the sun: The race is not to the swift, nor the battle to the strong; neither is the bread to the wise, nor the wealth to the intelligent, nor the favor to the skillful. For time and chance happen to all. 12For surely no man knows his time: Like fish caught in a cruel net or birds trapped in a snare, so men are ensnared in an evil time that suddenly falls upon them.