Two heads are better than one

Meaning: Collaboration and diverse perspectives lead to better solutions.

Origin: The thought is ancient — Ecclesiastes 4:9 opens with "Two are better than one" — and it was current in English by the late Middle Ages. John Heywood fixed the familiar wording in his 1546 Dialogue of proverbs, the first great anthology of English sayings. It is said when two people solve together what neither could manage alone.

Equivalents in French, Spanish, Japanese, German, Italian, and 6 more languages

French: Deux têtes valent mieux qu'une (literally: Two heads are worth more than one)
Spanish: Dos cabezas piensan mejor que una (literally: Two heads think better than one)
Japanese: 三人寄れば文殊の知恵 (Sannin yoreba monju no chie) (literally: Three people together have the wisdom of Manjushri)
German: Vier Augen sehen mehr als zwei (literally: Four eyes see more than two)
Italian: Vedono più quattr'occhi che due (literally: Four eyes see more than two)
Portuguese: Duas cabeças pensam melhor do que uma (literally: Two heads think better than one)
Dutch: Twee weten meer dan één (literally: Two know more than one)
Russian: Одна голова хорошо, а две лучше (Odna golova khorosho, a dve luchshe) (literally: One head is good, two are better)
Polish: Co dwie głowy, to nie jedna (literally: Two heads are not one)
Chinese: 三个臭皮匠，顶个诸葛亮 (Sān gè chòu píjiàng, dǐng gè Zhūgě Liàng) (literally: Three humble cobblers equal one Zhuge Liang)
Turkish: Akıl akıldan üstündür (literally: One mind outdoes another)