When you feel so unworthy a sentiment rising within you...

Beginners in the service of God
sometimes lose confidence when they fall into any fault.
When you feel so unworthy a sentiment rising within you, you must lift your heart to God
and consider that all your faults, compared with divine goodness,
are less than a bit of tattered thread thrown into a sea of fire.
Suppose that the whole horizon, as far as you can see from this mountain, were a sea of fire;
if we cast into it a bit of tattered thread, it will disappear in an instant.
So, when you have committed a fault, humble yourself before God,
and cast your fault into the infinite ocean of charity
and at once it will be effaced from your soul; at the same time all distrust will disappear.

St. Paul of the Cross