For years she hardly prayed at all “under the guise of humility.” She thought as a wicked sinner she didn’t deserve to get favors from God. But turning away from prayer was like “a baby turning from its mother’s breasts, what can be expected but death?”
As she started to pray again, God gave her spiritual delights: the prayer of quiet where God’s presence overwhelmed her senses, raptures where God overcame her with glorious foolishness, prayer of union where she felt the sun of God melt her soul away…
In her books, she analyzed and dissects mystical experiences the way a scientist would.
She never saw these gifts as rewards from God but the way he “chastised” her. The more love she felt the harder it was to offend God. She says, "The memory of the favor God has granted does more to bring such a person back to God than all the infernal punishments imaginable."
[Teresa felt the true desire to “avoid the near occasion of sin” not because she “dreaded the loss of Heaven and the pains of Hell,” but because she grew in Love and didn’t want to offend our Lord. - Miserissima]
One confessor was so sure that the visions were from the devil that her told her to make an obscene gesture called the fig every time she had a vision of Jesus. She cringed but did as she was ordered, all the time apologizing to Jesus. Fortunately, Jesus didn’t seem upset but told her that she was right to obey her confessor. In her autobiography she would say, “I am more afraid of those who are terrified of the devil than I am of the devil himself.” The devil was not to be feared but fought by talking more about God. (excerpted from
here)