You can remember the meaning of 正义 with this easy mnemonic:
<strong>Justice</strong> (义) is not just avoiding wrong-doing but also involves taking positive actions and developing the right cultural values. Even if one wants to walk a <strong>straight</strong> (正) path, it's difficult if all roads are built curved.
Using mnemonics to remember the meaning of Chinese characters like can have an enormous impact on how long to learn Mandarin it takes.