Love

"For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him." - John 3:16-17

No greater love is there than the love of God for us his children. So, when you are trying to call others to the Christian way of life, do not condemn them, but offer love, just as Jesus didn't condemn us but gave his life for us in love, so that we might be saved.