Gregory the Great

(up sup.) For every sinner who thinketh earthly things, not seeking those that are in heaven, is unable to look up. For while pursuing his baser desires, he declines from the uprightness of his state; or his heart is bent crooked, and he ever looks upon that which he unceasingly thinks about. The Lord called her and made her upright, for He enlightened her and succoured her. He sometimes calls but does not make upright, for when we are enlightened by grace, we ofttimes see what should be done, but because of sin do not practise it. For habitual sin binds down the mind, so that it cannot rise to uprightness. It makes attempts and fails, because when it has long stood by its own will, when the will is lacking, it falls.