Perseverance: flex: give in; flex: bend. It is a metaphor for not giving in under pressure and being very tenacious.

Indomitable: fold: setback; scratch: bend. It is a metaphor for being strong-willed and never wavering no matter how many times you suffer setbacks.

Unwavering: shift: change, change. Stable and strong, unwavering.

A strong heart can penetrate a stone: A firm will can penetrate a stone. It means that as long as you are determined, things will succeed.

Unshakable: Describes a firm attitude that cannot be shaken. It also describes strictly abiding by regulations and never changing them.

Perseverance: Tough: resilient; Pull: shake, change. Describes firm will and unswerving

Persistence: Yu: change. Stick to your covenant or promise and never change it.

Always unremitting: Never let up from the beginning to the end.

Perseverance: Relaxation: Relaxation. Stick to it and never give up.

Perseverance: persistence: perseverance; heng: perseverance. Stick with it for the long haul.

To wear through the iron inkstone: to wear through the iron inkstone. It is a metaphor for studying hard and having perseverance.

Grind an iron rod into a needle: Grind an iron rod into a needle. It is a metaphor for any difficult job. As long as you have perseverance and work hard, you can overcome difficulties and achieve results.

The iron pestle becomes a needle: a metaphor that as long as you have perseverance and are willing to work hard, you can succeed.

Perseverance: carving: carving; shedding: stopping. Continuously carving. It is a metaphor for perseverance and perseverance.