"secret things" about the Holy Spirit. However, I can provide some general information and beliefs about the Holy Spirit according to Christianity, which holds the Holy Spirit as the third person of the Trinity:

• The Holy Spirit is considered to be God, coequal and coeternal with the Father and the Son.
• The Holy Spirit is often described as a comforter, counselor, and helper.
• The Holy Spirit is believed to be present in the world to guide believers in their faith and to help them live a life that is pleasing to God.
• The Holy Spirit is said to indwell believers, meaning that believers have the Holy Spirit living within them and guiding them.
• The Holy Spirit is associated with a number of gifts, including wisdom, knowledge, faith, healing, miracles, prophecy, discernment, and speaking in tongues, among others.

It's important to note that beliefs and interpretations of the Holy Spirit can vary among different Christian denominations and individual believers