"Jesus answered and said unto her (the woman at the well), whosoever drinketh of this water shall thirst again: But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life." John 4:13-14
Everlasting life, what an incredible idea. God is so gracious with us. Think about it: All that God has done to bring into existence all things and then to put it all in motion and then to sustain it, all while listening to and watching us whine and complain about it and literally billions of people even deny that God exists at all. That's the difference in God and man. We wouldn't be so gracious with all those who denied us if we were the creator, but God loves us so much and has mercy without end.
The internal well that springs up from within us is supplied by the Holy Spirit; a perpetual, endless supply of the spirit that testifies of God in us. It's like if you were in a desert place and there were men and women around you, parched and dreary from the heat and you had just taken a big drink of ice cold spring water and you were refreshed. The others would look at you and wonder how you could possibly be refreshed and they so parched. That's what you should look like to a lost and dying world.
Jesus' story at the well is our story also. You can lead people to the well and tell them about the endless supply of God's love and mercy and compassion and forgiveness. You can offer them this free gift. When others look at you are they seeing a refreshed soul in a desert place? Does your presence make them wonder where you get it?