Eph. 3:12...that Christ may dwell in your hearts through faith; that you being rooted and grounded in love, may be able to comprehend with all the saints what is the width and length and depth and height - (of that love.) In order to be grounded in something you need to have a good understanding of what that thing is. You have to have a firm conviction in your heart. Example - I am firmly grounded in the belief that there is One God.I believe that Jesus is the Son of God. I am grounded in the belief that there is only one way to God, and that is through excepting Jesus as your Lord and Savior. There is nothing in this world that will ever change my belief in this. I am grounded. What has caused me to have such a firm conviction? I have experienced the unconditional love of God. I know without a shadow of a doubt that He loves me. He's not mad at me. He forgives me. He has a wonderful plan for my life and one day, when this life is over, I will spend eternity with Him. If you don't feel grounded today, ask God to reveal His love in a greater measure, for He is Love.