When the salt is taken out of God's gift of knowledge, there is no knowledge. When knowledge is learned, used, or taught without salt, it isn't hollow, it isn't less than hollow, it's against knowledge.
Knowledge without salt, is a travesty. All of the Word has salt, all of the Word is God, and all of the Word is love.
Knowledge for the sake to 'know and do' anything robotically is without purpose. Knowledge for the sake to 'know and do' in an understanding to emotionally love with said knowledge, has purpose.
All knowledge received, has exceeding extraordinary salt. All knowledge to give is commanded by God's law to have exceeding extraordinary salt.
God's knowledge isn't just to do, but to love in purpose with while doing so. Jesus didn't go to Calvary only because He knew that He was supposed to go, God forbid. Obedience is from love, but obedience was a given, Jesus went to Calvary to show love in all ways.
Jesus said in John 15:12 This is my commandment, that ye love one another as I have loved you.