Romans 10:6-10 AMPC
But the righteousness based on faith [imputed by God and bringing right relationship with Him] says, Do not say in your heart, Who will ascend into Heaven? that is, to bring Christ down;
Or who will descend into the abyss? that is, to bring Christ up from the dead [as if we could be saved by our own efforts]. [Deut. 30:12, 13.]
But what does it say? The Word (God's message in Christ) is near you, on your lips and in your heart; that is, the Word (the message, the basis and object) of faith which we preach, [Deut. 30:14.]
Because if you acknowledge and confess with your lips that Jesus is Lord and in your heart believe (adhere to, trust in, and rely on the truth) that God raised Him from the dead, you will be saved.
For with the heart a person believes (adheres to, trusts in, and relies on Christ) and so is justified (declared righteous, acceptable to God), and with the mouth he confesses (declares openly and speaks out freely his faith) and confirms [his] salvation.
AMPC: Amplified Bible, Classic Edition