Many of us already experience a slight weariness in our fastings but I encourage you to stick to the Lenten Rule of Life you instituted Ash Wednesday. Keep going saints, because the fruits of a fast well done are blessed.
Sometimes we cannot find the right words to express our particular struggles with sin and I am thankful for others who have composed very good prayers and meditations to help us. Here is todays prayer from the Canon of St. Andrew of Crete. I include alternate word choices from different translations. May the Lord grant us a truly great Lent.
Ode 7 (Third Thursday)
We have not watched or done as Thou hast commanded us,
but do not give us up utterly, O God of our fathers.
Have mercy upon us, O God, have mercy upon us.