How loudly are you breathing right now? By that simple question, I have probably made you think about something your body has been doing almost without thought all day. Our lungs fill with air, our heart beats, our organs function, and all our body continues to live often without us even giving the process of life a second thought. God is the giver and sustainer of that physical life. When we are not even considering the functions of our bodies, He is continuing to keep us alive. And there is an even greater life still that He gives to us:
John 6:57 - "As the living Father sent me, and I live because of the Father, so whoever feeds on me, he also will live because of me."
It's a powerful thing to say that Jesus came to bring us life (John 10:10). This verse adds another mind-blowing level of glory to that truth. Jesus is saying that in the same way that He has life because of the Father, we have life because of Jesus. We could mine the riches of this statement for all eternity and still only scratch the surface of its beauty.
For those that feed on (believe in) Jesus Christ, they are united with the life of Jesus in much the same way that the life of Jesus is united with the Father, and the Holy Spirit in us is the proof of this (Ephesians 1:13). This is why the concept of the Trinity shouldn't remain in thick and dusty books on theology. The truth and life of the Trinity is at work in us every single day, providing the life and grace that we need to walk in the works that God prepared for us.
This truth is also why you can't find satisfaction anywhere else but in Christ. If your very life comes from Him, then to search for life anywhere else is quite literally a pointless pursuit. It's on the same level of absurdity as eating dirt, hoping that it will sustain your hunger and keep you alive - it won't because it can't. For us to search for life outside of Jesus is as absurd as Jesus searching for life outside of the Father. If you think that language is too strong, you don't quite understand what it means to be in Christ and to "live because of Him."
To make this truth even more encouraging, let me point out also that this is why once we are "in Christ," we cannot lose that position and status. It's not possible for you to lose your salvation because you've been united in Him in much the same way that He is united to the Father. This is just another reason why it's called "Amazing Grace." To believe in Jesus is to be united with Him forever. The reason you can't lose your salvation is because you didn't purchase it in the first place - Jesus did - and He's the "author and perfecter of our faith" (Hebrews 12:2).
What do we do with all of this? Well, there's about a thousand applications of this truth. My encouragement to you would be to rest in it today. Meditate on your life in Christ and what that means for you because of the sacrifice of Jesus on your behalf. Rest in Jesus with more confidence than you place in your heart continuing to beat without your input. He gave you life and He will sustain your life. That's Good News if I ever heard it.