Cold prayers are a sacrifice without fire.
– J.C. Ryle

When you pray, rather let your heart be without words
than your words without heart.
– John Bunyan

If your knowledge of doctrine does not make you a great man of prayer,
you had better examine yourself again.
– Martyn Lloyd-Jones

 Prayer will make a man cease from sin,
or sin will entice a man to cease from prayer.
– John Bunyan