Here is a simple, Jain-inspired birthday wish you can share with Sai T:

May this birthday bring you inner peace, calmness of mind, and unwavering compassion for all living beings. May you walk the path of ahimsa (non-violence), truth, and self-control, and may your heart be filled with joy, gratitude, and mindful joy in every moment. Wishing you good health, spiritual growth, and lasting happiness on your special day and always.

If you’d like, I can tailor a shorter or more formal version.