1 Corinthians 13:11

When I was a child, I talked like a child, felt like a child, reasoned like a child: when I became a man, I put from me childish ways.

1 Corinthians 3:1-2

And as for myself, brethren, I found it impossible to speak to you as spiritual men. It had to be as to worldlings--mere babes in Christ.

1 Corinthians 14:20

Brethren, do not prove yourselves to be children in your minds. As regards evil, indeed, be utter babes, but as regards your minds prove yourselves to be men of ripe years.

Galatians 4:1

Now I say that so long as an heir is a child, he in no respect differs from a slave, although he is the owner of everything,

Treasury of Scripture Knowledge

Summary

When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things.

Bible References

I spake

1 Corinthians 3:1
And as for myself, brethren, I found it impossible to speak to you as spiritual men. It had to be as to worldlings--mere babes in Christ.
1 Corinthians 14:20
Brethren, do not prove yourselves to be children in your minds. As regards evil, indeed, be utter babes, but as regards your minds prove yourselves to be men of ripe years.
Galatians 4:1
Now I say that so long as an heir is a child, he in no respect differs from a slave, although he is the owner of everything,