If you believe, love, and trust in God with all your heart, you will receive at least the following ten gifts from him: (1) joy, (2) peace, (3) freedom of the heart, (4) patience, (5) courage, (6) humility, (7) compassion for others, (8) discernment of God's will, (9) detachment from the world, and (10) purity of heart.
In The Fulfillment of All Desire, Ralph Martin, the fruits of union with God include (1) freedom from self-concern and fear of what others will think, (2) a pure heart, (3) an immense fortitude in the service of love, (4) continual prayer, (5) finding joy in everything, (5) rediscovery of the creation in God ~ seeing it as it truly is, (6) heightened sense of seeing good and evil, (7) deep, solid, interior calm, (8) constant peace and joy, (9) the experience of the almost continual presence of God, (10) being dead to every selfish impulse, (11) enjoying habitual sweetness and tranquility, (12) inebriation in the Holy Spirit.
All the above and more can be yours, if you so desire.