He's more likely to be someone who plays by the rules, avoids dangers, and bets on the sure thing.

他们只会循规守据,只做自己有把握的事情，绝不做任何有风险的事。

耶鲁公开课 - 政治哲学导论课程节选

Either that you are certain of something, that you are not certain of something,

一种是表达你对某件事情很有把握或者并没有什么把握，

I'm sure 课堂 - SpeakingMax英语口语达人

You can say "I'm sure that" to express the idea that you are certain of something.

你可以用 "I'm sure that" 来表达你对某件事有把握。

I'm sure 课堂 - SpeakingMax英语口语达人