In today's reading is one of the most direct statements that Jesus is the one and only way to eternal life. It is reassuring to hear these words. It is difficult to do sometimes in today's hectic, chocker block full, life, but these words should bring peace unto us and thus help us navigate our lives.
"He who has the Son has life;" Whoever believes in Jesus has eternal life. Please note the tense of the verb. It is present tense. It is not will have eternal life, it is has eternal life. You do not need to wait for eternal life because it begins the moment you believe. It is continuous. There is not an ending to one life (i.e., death) and a beginning of another. Sure you might lose your human body, but the eternal life promised by God will endure.
We do not even have to work for eternal life, because it is already ours if we believe in Jesus. We do not have to worry about it because we have been given this gift by God - and God has guaranteed it.
Yes, today's reading should be seen as extremely reassuring. "Who is it that overcomes the world? Only he who believes that Jesus is the Son of God." (1 John 5:5) Today's reading should help us keep things in the proper place. God promises that all who believe in His son, Jesus, will have eternal life with Him. What a glorious, generous, and loving God we serve.
Wishing you much success in your walk with Christ,