If we love God with all our heart and soul, all our strength, and all our mind, then we need not fear. God gives us the Holy Spirit which fills us with love, power, and a sound mind.
Don’t miss that. I read those two passages for years before I saw the connection. Let me show you again.
“And you shall love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength.” – Mark 12:30
For God has not given us a spirit of fear, but of power and of love and of a sound mind. – 1 Timothy 1:7
If we love God with all our heart and soul, in as much as we are humanly capable, the Holy Spirit perfects our efforts by filling us with His love.
If we love God with all our mind, at least as much as we are humanly able, then the Holy Spirit perfects our efforts by giving us a sound mind.
If we love God with all our human strength, then the Holy Spirit will perfect our efforts and fill us with His power, the power to overcome sin and death, that which we fear.
Fear Not, for God has given us the spirit of power, the power of His Holy Spirit.