How to handle thoughts about past and future?

Take with you the peace and quietude and joy and keep it by remembering always the Divine.

If the thoughts about the past and the future come merely as memories and imaginations, they are of no use and you should quietly turn away your mind from them back to the Divine and to the yoga. If they are anything to the purpose, then refer them to the Divine, put them in the light of the Truth, so that you may have the truth about them or the right decision or formation for the future, if any decision is needed.

There is no harm in the tears of which you speak, they come from the soul, the psychic being, and are a help and not a hindrance.

Ref : Letters of Yoga Vol. III