pick one's battles

Verb

 * 1)  To involve oneself in disputes only if one is likely to win.
 * 2)  To take a stand for a cause only if it is truly important enough to be worth the costs.

Translations

 * Chinese:
 * Mandarin: 選邊站
 * Finnish: valita taistelunsa
 * Polish: uczestniczyć tylko w pewnych bitwach


 * Finnish: valita taistelunsa
 * Polish: walczyć tylko w ważnych dla siebie sprawach