Only now.

You must meditate without wasting time, thinking that there is only this day and this hour. After that, it becomes truly easy.
You must forget about the good and the bad of your nature, the strength or weakness of your power.

Dogen

Just be natural

I came across this little piece of advise today. I thought it was good.
-----------------

When you meditate, there should be no effort to control and no attempt to be peaceful. Don't be overly solemn or feel that you are taking part in some special ritual; let go even of the idea that you are meditating.
Let your body remain as it is, and your breath as you find it.

Sogyal Rinpoche
-------------------------------

Letting the mind clear

I often compare the mind in meditation to a jar of muddy water:
the more we leave the water without interfering or stirring it,
the more the particles of dirt will sink to the bottom,
letting the natural clarity of the water shine through.

Sogyal Rinpoche