He took an oath to himself to succeed.

He made a self-oath to achieve his goals.

He started a new project, having stood ready and had his bow drawn.

The tense in Japanese is different from English.

He calls himself a professional guitarist.

He is a self-styled professional guitarist.

Having time for self-reflection is important for personal growth.

He thinks it's important to have time for self-reflection.

I decided to resign from the company.

He has temperance and always acts calmly.