Too much focus on one's career may lead to one being uninteresting company. / Too much hard work and not enough leisure time can be unhealthy.

Alternative form of what doesn't kill you makes you stronger

Hardship builds moral character.

When you notice that an enemy is making an error, take care not to interfere with the enemy from completing it so you can take advantage at the right time.

A person who goes to bed early and wakes up early will lead a more successful life.

Alternative spelling of troublemaker

Someone who makes; a person or thing that makes or produces something. / (usually capitalized and preceded by the) God. / (now rare) A poet.

A temporary (usually insubstantial) substitution.

Made to work or suffice; improvised; substituted.

(obsolete) A rogue; a shifty person.