Spiritual joy-bliss-rapture makes the mind/the heart bright, light, pliable, and open. It's rooted in our practice along the way of this journey to awakening. This bright and buoyant energy of mind and body helps to inspire and sustain the effort that is needed for practicing.
The bright and buoyant energy of joy, this "lightness of being", and the arising calm and quiet of a tranquil body and mind are essential aspects and fruits of this path along the way to awakening.
The Buddha's invitation to us is "to come and see" for ourselves what is true. Investigation is the "activity" of mindfulness. It's the activity of discernment. It illuminates the object. When things are brightly lit, what is already present is then clearly seen and known, and confusion is dissipated.
"EHI PASSIKA" "Some and See" investigation is the active aspect of mindfulness. It brings a clear discernment of our body-mind experience. Investigation is what lights up the truth for us.