They know enough who know how to learn.

Knowledge in youth is wisdom in age.

When you learn a little, you feel you know a lot. But when you learn a lot, you realize you know very little.

To learn is to be young, however old.

The very young are not ready for much knowledge. It must be given to them slowly, in proportion to their years of life. One must first live before he can safely know.

but those as knows the least have a habit of thinkin' they know all there is to know, while them as knows the most admits what a turr'ble big world this is. It's the knowing ones that realize one lifetime ain't long enough to git more'n a few dips o' the oars of knowledge.

Its what you learn when you know it all that counts

The beginning of wisdom, as they say. When you're seventeen you know everything. When you're twenty-seven if you still know everything you're still seventeen.

Know a little about a lot.

One of the reasons children learn rapidly is because they are empty vessels; they know they don’t know. Some people who claim to have twenty years of experience have one year of experience that they’ve repeated twenty times.

This is what youth must figure out:
Girls, love, and living.
The having, the not having,
The spending and giving,
And the meloncholy time of not knowing.

This is what age must learn about:
The ABC of dying.
The going, yet not going,
The loving and leaving,
And the unbearable knowing and knowing

Learning is finding out what you already know

Old age that's quick to learn is always young.

The means of learning are abundant, the desire to learn is scarce