How many meanings are in one jesus's sayings?

Since, everyone are fluent in chrisitianity and nothing else, I have no choice but to tallk about chrisitianity.

Jesus said, " It is time for the son of man to recieve great glory. In order to do so, he must be like a seed and drops to the ground and die so it can produce more seeds"

Can a seed that is from in old old fruit, still have energy to grow as that of the middle age fruit?

Jesus said," You do not understand what I am doing now, but you will understand later" while, washing his disciples feet.

is there but one interpretation or many?