From Key of Heaven

Six Truths which we must know and believe:

1. There is only one God who created all things, and who preservers and governs all things.
2. God is a just Judge, who rewards the good and punishes the wicked.
3. In God there are three Persons:  the Father, the Son and the Holy Ghost.
4. The second Person of the Blessed Trinity became man, to redeem us by His death and to make us eternally happy.
5. The soul is immortal.
6. The grace of God is necessary for salvation.