A dictionary of Proverbs (Oxford Paperback Reference)

Those who live in GLASS houses shouldn’t throw stones
Do not criticize or slander another if you are vulnerable to retaliation. Cf. c 1385 CHAUCER Troilus & Criseyde II. 867 Who that hath an hed of verre [glass], Fro cast of stones war hym in the werre!

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  1640 G. HERBERT Outlandish Proverbs no. 196 Whose house is of glasse, must not throw stones at another. 1754 J. SHEBBEARE Marriage Act II. lv. Thee shouldst not throw Stones, who hast a Head of Glass thyself. .. Thee canst have no Title to Honesty who lendest the writings to deceive Neighbour Barter. 1778 T. PAINE in Pennsylvania Packet 22 Oct. i. He who lives in a glass house, says a Spanish proverb, should never begin throwing stones. 1861 TROLLOPE Framley Parsonage I. vi. Those who live in glass houses shouldn’t throw stones. .. Mr. Robarts’s sermon will be too near akin to your lecture to allow of his laughing. 2001 W. NORTHCUTT Darwin Awards II i. 16 Judea and Samaria district police jointly determined that the accidental crash was caused by the stone-throwing young men. People who live in glass houses shouldn’t throw stones. ■ hypocrisy; self-preservation; slander
  

All that GLITTERS is not gold
‘Glisters’, despite its Shakespearean authority, is now less often found than ‘glitters’. The variant form illustrated in quots. 1773 and 1987 is also common. L. non omne quod nitet aurum est, not all that shines is gold.

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  c 1220 Hali Meidenhad (EETS) ii. Nis hit nower neh gold al that ter [there] schineth. c 1390 CHAUCER Canon’s Yeoman’s Tale 1. 962 But al thyng which that shineth as the gold Nis nat gold, as that I have herd it told. 1596 SHAKESPEARE Merchant of Venice II. vii. 65 All that glisters is not gold, Often have you heard that told. c 1628 W. DRUMMOND Works (1711) 222 All is not Gold which glittereth. 1773 D. GARRICK in Goldsmith She stoops to Conquer (Prologue) All is not gold that glitters. Pleasure seems sweet, but proves a glass of bitters [bitter-tasting medicine]. 1847 C. BRONTE Jane Eyre II. ix. I wished to put you on your guard. It is an old saying that ‘all is not gold that glitters’. 1880 Dict. English Proverbs (Asprey Reference Library) 39 All that glitters is not gold. 1933 E. B. BLACK Ravenelle Riddle iv. All that glitters is not gold. .. Every bird who calls himself an American doesn’t happen to be one. 1987 D. FISKE Murder Bound (1989) ii. 11 The old saw ‘all is not gold that glitters’ still holds true despite its standing as a platitude. 1998 Country Life 22 Jan. 50 (caption) In the volatile world of jewellery investment, all that glisters is not gold. ■ appearance, deceptive