“The present moment is filled with joy and happiness. If you are attentive, you will see it.” ― Thích Nhất Hạnh
The present is the only moment there is. The present is sometimes seen through a veil of experiences that can colour ones view of reality and a lot of these imprints are created at the impressionable time of childhood. Situations bring up emotions which we translate as good or bad based on mind signals.
"Dvesa (aversion) is an emotional repulsion and flight from pain, manifesting as prejudice and hatred and making it impossible for us to learn from life's hardships and our own mistakes" - B.K.S. Iyengar, Light on Yoga
Emotions could be seen as "energies in motion" and when we don't express or breathe through them they can create blocks within the body.