God is the strength of your heart physically and spiritually. He made it. His energy actuates and controls it. It your heart appears to be weak, God can strengthen it. Release all fear.
Focus on and bless your heart with love and positive words of faith and life, such as these:
My heart is filled with love and with the purpose of knowing and expressing Truth.
I do not believe in evil. Perfect love has removed all fear.
My heart is right with God, and it is now pure, whole, and harmonious, through the Christ Spirit in me.
I am at peace with myself and all humanity.