"On that day about three thousand believed his message and were baptized. They spent their time learning from the apostles, and they were like family to each other. They also broke bread and prayed together." (Act 2:41-42 CEV)
When we were born again, spiritual instincts are activated in our lives. A baby born in this world inherently longs for milk. Babies don’t need to be instructed on how to suckle, the skill just naturally happens. The same is true with newly saved Christians. There are natural spiritual desires that emerge from the heart such as reading the Bible, praying, going to church, joining a Bible study, and more. As baby Christians, they need to be nursed and weaned. This is true discipleship, helping another to grow in Christ.
We embrace the maturity of time that we grow out of instinct and continue by making grownup decisions.
"Therefore let us leave the elementary teachings about Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment. And God permitting, we will do so." (Heb 6:1-3 NIV)