I grow weary and praying is hard.
John of Cronstadt advised:
"It is said that we soon grow weary of praying. Wherefore? Because we do not vividly represent to ourselves the Lord, Who is at our right hand. Look upon Him unceasingly with the eyes of your heart, and then, even if you stand praying all night, you will not grow weary."
"Our heart daily dies spiritually. Only ardent, tearful prayer quickens it, and makes it breathe again. If we don’t do daily pray with sufficient spiritual fervor, we may easily and speedily die spiritually."