In plants, there is a tissue that dies in maturity but remains essential to the plant’s growth. It is called the sieve tube. It started out as a living cell, but as it matures, it is denucleated. It is part of the phloem, which functions as a food conductor of the plant. The sieve tube is always accompanied by companion cells, and these cells get the nutrients from the sieve tube, or it can also transfer nutrients to the sieve tube.
The sieve tube is dead, but essential to the plant’s survival and growth. Actually, the sieve tube’s real function starts when it dies. By dying, it facilitates the survival and growth of the plant.
Maybe it’s the same thing with us. We must “die” to ourselves everyday, because by doing so, we gain Christ.