Today is the day we remember Jesus in the tomb. We remember the grief of His blessed mother, of His followers. We remember, like the seed growing beneath the ground, His "harrowing of hell" so often depicted, especially in the Middle Ages.
What I am reminded of today is baptism. My wife and I help with baptism preparation at our parish, and I always begin those sessions with reading Romans 6:1-11. Most pertinent for Holy Saturday is this part of that passage:
Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? We were buried therefore with him by baptism into death, so that as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life. For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his. (Romans 6:3-5)
By our baptism, we were buried with Him. Especially when baptism involves immersion, we see the symbolism of this burial. We share in His time in the tomb, as we die to sin, die to self, so that we may experience the Easter joy of a resurrection with Him.