Rabbi Elazar ben Azaryah says: If there is no Torah study, there is no derech eretz (worldly involvement); if there is no derech eretz, there is no Torah study. If there is no wisdom, there is no fear of God; if there is no fear of God, there is no wisdom. If there is no reason, there is no understanding; if there is no understanding, there is no reason. If there is no flour, there is no Torah; if there is no Torah, there is no flour.

Source: Translation modified from Soncino Classics, Version 2.2. Hebrew text from Mechon Mamre.