Do some LSD, have an incredible life-changing spiritual experience, and then return to normal life spiritually regenerated.
EDIT: Actually, no. Don't do drugs. Nonetheless, some sort of spiritual experience could be just what you need. I find such experiences in prayer, in the liturgy, in the ecclesiastical chant of the Orthodox Church, and in studying theology. There have literally been times when the beauty of the liturgy has nearly reduced me to tears - during the Bridegroom Matins on Holy Tuesday, I was utterly blown away by the choir's powerful chanting of the Alleluiarion. As I listened to those powerful voices chant that incredible inspired melody all I could think about was my love for God, and all I could feel was the most incredible assurance of God's existence (something which I need, because I often struggle with doubts, unfortunately). Once after a theology class I stayed back to talk to the lecturer (A Catholic priest) about some of the things which had been discussed in the class, and I left feeling overwhelmed with love for God and passion for my spirituality.
Also, good works bring about spiritual passion, as Tolstoy could surely tell you in his book 'Resurrection.'