Just as the Trinity represents the three manifestations of God - Father, Son and Holy Spirt - we as His disciples, once we claim Him, are living manifestations of Him.
As a result, if we are truly in Him, everything we do is a reflectionf of Him and of His plan and love for us. This means that our lives are no longer our own, but His to use in order to reflect His love and mercy to all mankind.
Each in our own way, as unique creations of His, remain ourselfes but indwelt by His spirit - the Holy Spirt -to use our talents and weaknesses to His best use.