Maturity or Death?

"Therefore let us move beyond the elementary teachings about Christ and be taken forward to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God." Hebrews 6:1


I came across this verse today and something struck me which I don't think I've noticed before. The phrase, "not laying again the foundation of repentance from acts that lead to death,". Why does the writer of Hebrews admonish us to move toward maturity beyond the elementary teachings about Christ? It seems to me, that the alternative is being at risk of moving back to a position where we are participating in acts that lead to death. I'm not going to delve into the question of eternal security here, but if remaining immature in one's faith put's one at risk of returning to acts that lead to death, I want to move toward maturity and a choice for life.