The hand sows, the eyes harvest?

Answer: To read and to write.

More Difficult Riddles with answers

More Difficult Riddles

The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
The land was white the seed was black it'll take a good scholar to riddle me that. What is it?
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
The moon is my father. The sea is my mother. I have a million brothers. I die when I reach land
The more holes you cover the lower it goes.
The more of them you take, the more you leave behind. What are they?
The more you take, the more you leave behind.
The older they are the less wrinkles they have.
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
The root tops the trunk on this backward thing, that grows in the winter and dies in the spring.