This is what pisteuo is, what true saving Faith is. The English language doesn't have a word to translate all three aspects of pisteuo. Belief is only one third of pisteuo. Taken on it's own is error.
8But what saith it? The word is nigh thee,
even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
9That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. 10For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
11For the scripture saith, Whosoever believeth on him shall not be ashamed.
12For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
3 aspects of saving faith:
1. An appeal of mind/intellect "The word of faith, which we preach"
2. An appeal of heart/ emotions "..and in thy heart... believe in thine heart
3. An appeal of decision/will "Whosoever believeth"