固く心を決めての英語

to make up one's mind

put firmly in the mind

Keep a good heart!

to be deeply determined about or on something

to keep one's mind closed

to make up one's mind―determine―resolve

to come home to one's heart

to brace oneself up―screw up one's courage

a retentive mind

a condition of being in ecstasy over something

to be concerned about something

the action of making something by using the utmost attention and care

to communicate one's thoughts to another

of a person, to stay restless

to train oneself, striving for perfection of the mind

the act of doing something enthusiastically and with care

He has a firm character―a firmness of character.

of a person, to ask oneself about something

of a person, to purify himself or herself

to make a concentrated effort

to turn up the wick―turn down the wick

bearing in mind

being excited

to brace oneself （up）

arrange and integrate in the mind

He behaves as if he had some end in view.

to make a person's heart wicked

to keep (something) in one's mind

to devote oneself to anything

to impress ［imprint, stamp, engrave, inscribe］ a fact on one's mind―into one's soul