Luke 10:27 NIV Bible
He answered, “ ‘Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind’; and, ‘Love your neighbor as yourself.’

The symbol of the Cross is this simple;
A vertical commandment: Love the Lord with everything
A horizontal commandment: Love your neighbor as yourself

And when you put the vertical and horizontal together, you make a cross.
You are then to carry that cross everyday.
And you are to carry that cross to your death.
Just like Jesus did, out of love for His Father and His love for us.