Post is a “fire and forget” where the UI thread work is performed asynchronously; Send is synchronous in that the call blocks until the UI thread work has been performed.

Shot up from broad rank blades that droop below, The nodding WHEAT-EAR forms a graceful bow, With milky kernels starting full, weigh’d down, Ere yet the sun hath ting’d its head with brown;

And if it were not for theſe Principles the Bodies of the Earth, Planets, Comets, Sun, and all things in them would grow cold and freeze, and become inactive Maſſes ; […].

Oh, thou mother of delights, Crowner of all happy nights, Star of dear content and pleasure, Of mutual loves the endless treasure!