When we tolerate the troubles, while performing our deeds without faltering in our duty, it becomes tapas (spiritual practice).

From the book Vasantha Sai Satcharitha 

This letter, which is only for You,

Becomes the wind of Sathya Yuga.

My call which never ends, thunder

The wisdom that arises, the lightning.

My tears are the water."

"Letter, letter, letter,

though your letters

You change God.

God is witness

Witness God become

Prema God.

Feelings, feelings, feelings,

Through your feelings

You change the world.

Without Pralaya

Kali Yuga becomes Sathya Yuga."