Paul, as well as the rest of the NT tells us exactly how to have eternal life......
1 John 2:25
"And this is the promise that He has promised us - eternal life."
1 John 5:11
"And the testimony is this, that God has given us eternal life, and this life is in His Son."
1 John 5:12
"Whoever has the Son has life; whoever does not have the Son of God does not have life."
1 John 5:13
"These things I have written to you who believe in the name of the Son of God, so that you may know that you have eternal life."
John 3:15
"so that whoever believes will in Him have eternal life"
John 3:16
"For God so loved the world that He gave His one and only Son, that whoever believes in Him shall not perish but have eternal life."
John 3:36
"Whoever believes in the Son has eternal life, but whoever rejects the Son will not see life, for God’s wrath remains on them."
John 5:24
“Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life."
John 5:38-40
"You do not have His word abiding in you, for you do not believe Him whom He sent. You search the Scriptures because you think that in them you have eternal life; it is these that testify about Me; and you are unwilling to come to Me so that you may have life.
John 6:47
"Truly, truly, I say to you, he who believes has eternal life."
John 10:28
"And I give them eternal life, and they will never, ever, by any means perish; and no one will ever snatch them out of My hand".
1 Timothy 1:16
"But for that very reason I was shown mercy so that in me, the worst of sinners, Christ Jesus might display His immense patience as an example for those who would believe in Him and receive eternal life."