The physical image of the Lord (Jesus) has not been seen for almost 2000 years. But when we receive His HolySpirit we know Him and His love and so love Him in return.
The HolySpirit Himself bears witness with our spirit, that we are His children: - Rom 8:16
If you are not experiencing joy that cannot be expressed in words you need to be filled with the glory of our God, the Holy SpiritOfChrist Jesus.