Only

Only light can enter the darkness. Darkness cannot enter the light.

Noise can enter silence. Silence cannot enter noise.

Determination can sprout in worse situations.

Nothing can deter the will power to survive.

You need not have a perfect teacher to be a perfect student.

You need not be a pioneer to coach pioneering.

You need not have a perfect spouse to be one.

You need not have a perfect nation to behave a perfect citizen.