“Intermingle…jest with earnest.”

“104. Leave jesting while it pleaseth, lest it turne to earnest.”

“If you give a jest, take one.
Let all your jokes be truly jokes. Jesting sometimes ends in sad earnest.”

“Many wise words are spoken in jest, but they don't compare with the number of stupid words spoken in earnest.”

“As my mother once said: The boys throw stones at the frogs in jest.
But the frogs die in earnest.”

“We may, indeed, indulge in sport and jest, but in the same way as we enjoy sleep or other relaxations, and only when we have satisfied the claims of our earnest, serious task.”
Ludo autem et ioco uti illo quidem licet, sed sicut somno et quietibus ceteris tum, cum gravibus seriisque rebus satis fecerimus.

“Irony is jesting hidden behind gravity. Humor is gravity concealed behind the jest.”

“In jest, there is truth.”

“There is no jesting with edge tools.”

“A jest breaks no bones.”