This is my favorite prayer, called Anima Christi or Soul of Christ. If you would like more information, Catholic Culture has a spiel on it.
Soul of Christ, sanctify me.
Body of Christ, save me.
Blood of Christ, inebriate me.
Water from the side of Christ, wash me.
Passion of Christ, strengthen me.
O good Jesus, hear me.
Within Thy wounds hide me.
Suffer me not to be separated from Thee.
From the malicious enemy defend me.
In the hour of death call me,
And bid me come unto Thee.
That with Thy saints I may praise Thee.
For ever and ever. Amen.
Growing Apologist 