Here is one of my all-time favorite prayers from Martin Luther (1483-1546):
an empty vessel that needs to be filled.
My Lord, fill it.
I am weak in the faith;
strengthen thou me.
I am cold in love;
warm me and make me fervent
that my love may go out to my neighbour.
I do not have a strong and firm faith;
at times I doubt and am unable to trust thee altogether.
O Lord, help me.
Strengthen my faith and trust in thee.
In thee I have sealed the treasures of all I have.
I am poor;
thou art rich and didst come to be merciful to the poor.
I am a sinner;
thou art upright.
With me there is an abundance of sin;
in thee is the fulness of righteousness.
Therefore, I will remain with thee of whom I can receive
but to whom I may not give.