"Nevertheless I am not ashamed: for I know whom I have believed, and am persuaded that he is able to keep that which I have committed unto him against that day." (2 Timothy 1:12)
The apostle Paul uses a precision of synonyms. We are to "know" the One in whom we have believed and to be "persuaded" that He is able to "keep" us....The knowledge Paul cited (Greek i'do) emphasizes mental understanding as opposed to experiential knowledge or intuitive perception.
Our confidence is not based on mere emotion but a on clear grasp of God's secure salvation....
For the full devotional by HMM III, go here.