关于坚强的意志的英语表达，可通过以下要点进行归纳：

一、核心表达

定义与特质

- "A man's strength depends not on how hard his shell is, but on how deep his scar is."（真正的力量不在于外壳的坚硬，而在于伤痕的深刻。）

- "The most terrible enemy is the lack of strong faith."（最可怕的敌人是信念的缺失。）

行动与转变

- "At first I pretended to be strong, then I was really strong."（起初假装坚强，最终真正变得坚强。）

- "Never know how strong you really are until being strong is the only choice you have."（直到别无选择时，你才会明白自己的力量。）

二、励志格言

坚持与希望

- "Keep on going, never give up."（勇往直前，永不放弃!）

- "When all else is lost, the future still remains."（即使失去一切，未来仍存。）

成长与挑战

- "The best preparation for tomorrow is doing your best today."（为明天最好的准备，就是今天全力以赴。）

- "He who has tasted the sweetness of solitude and endured the bitterness of loneliness, shall be able to enjoy the sweetness of union and the bitterness of separation."（只有经历过孤独的甜蜜与分离的苦涩，才能真正享受团聚的甜蜜与分离的苦涩。）

三、现实案例

描述室友从因父母限制阅读到享受自由却逐渐落后的转变，体现自我控制与意志力的冲突。