Natural mind is resting the mind. 

If mind is agitated, rest.

If resting the mind feels impossible, rest in the impossibility.

If it feels easy, rest with effortlessness.

After the mind goes searching for this why and that why, chasing thoughts and dreams, let it rest as it is.

Become absorbed into the vast nature of presence and then remain. Remain without aim. Remain without question. Allow concentration to settle into itself and become aware of its action as effortless.