意志

At twenty years of age, the will reigns; at thirty, the wit; and at forty, the judgement.

His strong will enables him to refuse all pleasures.

be independent of man's will

corporate will

iron will

will of the majority

be demoralized; be despondent; be in blue funk; be in low spirits

be unchangeable of purpose; have an inflexible will

be strong-willed/iron-willed; have an iron/invincible/unyielding will

have a weak will; be weak-willed

work one's will upon others; impose/lay one's will upon others

heighten one's will

weaken sb's volition

sap sb's will

lack will

maintain a firm will

execute/implement the will (of)

correspond to the will (of)

do the will (of)

temper sb's willpower; harden/steel/train/temper sb's will