Like as in the burnt offerings of rams and bullocks, and like as in ten thousands of fat lambs: so let our sacrifice be in your sight this day, and grant that we may wholly go after you: for they shall not be confounded that put their trust in you.
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Aquinas Study Bible
Contrite means sorely afflicted by the toils of repentance. Humble, that is, before God, so that the heart which is proud through arrogance becomes devoted through holy confession. Note the order, the heart could not be humbled if it had not become contrite through repeated afflictions. (Cassiodorus)
Sacrifice of ourselves. (Haydock)
They knew not yet whether they would escape. When they beheld the angel they had greater confidence, and broke forth into a hymn of praise. (Houbigant.)
They now offer all they can, a humble heart!