In order for plants to grow (specifically vines that produce grapes), the farmer has to cut off the dead/bad parts so that it doesn’t spread to the WHOLE plant causing the plant to die.
God comes and does the same with us, He speaks to us about the bad things (the sin) He doesn’t want in us, the stuff that will cause death. When we surrender our lives and those parts to Him, He prunes us, cuts away all the ugly. This helps us produce fruit. When you see these fruits (Galatians 5:22-23.. https://bit.ly/2TllZqx) in your life, get excited – it means you’re becoming more like Jesus!