Dear Amandine,
If you are asking about the power of Jesus, you are definitely on the right path! He is the WAY, the TRUTH, and the LIGHT. My experience has borne out His infinite greatness, tenderness, love, and power! His Word is truth.
The Bible teaches that we are beings made up of three parts, the body, the soul, and the spirit. The soul has several functions ("senses") -- the mind, the will, and the emotions. The mind reasons things out, the emotions give us information about how we feel about things, and the will decides what actions we will take.
Christianity seems irrational because, as the Bible says, spiritual things are ascertained by one's spirit, NOT one's soul. The mind cannot "figure out" the spiritual things of God because that is not its function.
Before one comes to know the Lord, one's spirit is, for all intents and purposes, dead, in that it is not in relationship with God (who is Life). However, His Holy Spirit quickens us to His truth, and leads us to understand that His Word (Jesus) is Truth.
Dearest Lord Jesus,
I pray that You make yourself known to this dear seeker, who would like to know you. I pray that You bring people into her life who will make Your face known to her, in unexpected and unique ways. I pray that Your Holy Spirit quicken her spirit to understand that You are truth. I ask you to make yourself known to her as a PERSON, not a religion, not a set of facts, but as a Person who lives always to seek and save that which was lost.
Lord, I pray that the set of circumstances that are operating in her life to lead her to ask this question be settled. I ask that You show your face to her in an unusual way. I pray that You will bring her to a deep and personal knowledge of Yourself. Bless her with Yourself, Lord!
Many blessings, and may the Lord shine His face upon you!