In the Bhagavad Gita, there is no long discussion, nothing elaborate. The main reason for this is that everything stated in the Gita is meant to be tested in the life of every man; it is intended to be verified in practice.

If you want to cut down a tree, it is no use to climb into its branches.

It is a curious phenomena that God has made the hearts of the poor, rich and those of the rich, poor.

We cannot fight new wars with old weapons.

If we wish our nature to be free and joyous, we should bring our activities into same order.

In nonviolence you must go full steam ahead, if you want the good to come speedily you must go about it with vigor.

The natural movement of one's soul is upwards. But just as any object is dragged down when a heavy weight is tied to it, the burden of the body drags down the soul.