A jest loses its point when he who makes it 40 is the first to laugh. Schiller.
A jest's prosperity lies in the ear / Of him that hears it, never in the tongue / Of him that makes it. Love's L. Lost, v. 2.
A Jove principium—Beginning with Jove.
A judge who cannot punish, associates himself in the end with the criminal. Goethe.
A judicious (verständiger) man is of much value for himself, of little for the whole. Goethe.
A king of shreds and patches. Ham., iii. 4. 45
A king's son is no nobler than his company. Gael. Pr.
A knavish speech sleeps in a foolish ear. Ham., iv. 2.
A l'abandon—At random; little cared for. Fr.
A la belle étoile—In the open air. Fr.