害人之心不可有，防人之心不可无

• 宀(roof)RADICAL
• 丰(abundant; plentiful)PHONETIC
• 口(mouth; speech)ASSOCIATIVE

Under a roof, abundant speech can harm others.

• 人(person; human (pictographic))ASSOCIATIVE

The character 人 depicts a person standing with legs spread wide apart for stability.

• 之(walk; arrive; step on ground)ASSOCIATIVE

A footstep moving forward on the ground represents "go to," which then becomes a grammatical particle.

• 心(heart (pictographic))ASSOCIATIVE

The character depicts a heart shape with three strokes like heartbeats, symbolizing the soul and emotions.

• 不(no; not; negation)ASSOCIATIVE

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 口(mouth; opening)RADICAL
• 丁(man; adult male)PHONETIC

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 月(moon; flesh (iconic representation))RADICAL
• 又(right hand; again)ASSOCIATIVE

A hand holding a piece of meat — that is 'to have'.

• 阝(earthen mound; rampart)RADICAL
• 方(direction; side)PHONO-SEMANTIC

Build fortifications on all sides to defend against enemies.

• 一(one; initial)ASSOCIATIVE
• 尢(disabled person; insufficient)ASSOCIATIVE

From the beginning there was a shortage, so 無 means 'nothing at all'.