How Can You Know That Jesus Loves You?

If every scientist in the world said that, as far as values go, honesty doesn't matter, science wouldn't cease to function. So i want to ask you about take it from a different direction. If there is just one thing that i would like every one on earth to know, the one thing i would choose is for them to know that jesus loves them. And if i say to some one, jesus love you, and they say to me, how can you even know that? How to help me proceed from there? Because among all i would like people to have confidence in knowledge, but more than anything, i would like them to have confidencein the love