[vicar7]

Tis a one time thing: turning going to other way. change of heart or mind that leads to change of direction. Believe means trust in rely on. Gospel is Jesus came as God in the flesh to die for sin and rose again that we might have life in him.

[Daniel Gregg]

You can redefine repentance to mean merely a change of mind about beliefs, but that is not how the Scriptures define it. Repentance is not a change of mind to believe certain doctrines one did not believe before. Repentance is a sincere change of mind about sin, and being of a sincere nature logically leads to abandonment of sinful life whereever it is discovered in one's lifestyle.

The paramount text for what 'believe' means is Genesis 15:6, where the Hebrew word is האמין. This word means to "support". Literally, "Abraham made his support with YHWH". So you see it means more than just to support facts, or make someone your support. It also means to support the someone. Similarly, the English word "commit" which is in the Lexicons and is used in the KJV for πιστευω means to commit one's support to a person as well as to be committed to that persons care. Now of course one will believe what God says if one is committed to him, but belief is not even half the story.