Lencho, the protagonist in the story "A Letter to God," went out when the big drops of rain were falling because he was worried about his crops.

Reasons for Lencho's concern:
- Lencho was a poor farmer who relied on his crops for his livelihood.
- His crops had already been damaged by a hailstorm earlier in the season.
- He had written a letter to God asking for money to help him replant his crops.

When Lencho saw the big drops of rain, he believed that God had answered his letter and was sending him the money he had asked for. He ran out to collect the money, not realizing that the rain was actually too heavy and would cause more damage to his crops.

This action shows Lencho's strong faith in God and his belief that God would answer his prayers in a tangible way.

In the end, Lencho's letter did not reach God, but instead was read by the postmaster who was moved by Lencho's faith and generosity. The postmaster and his colleagues collected money to send to Lencho, who received it with gratitude and continued to have faith in God's providence.

He went out to fell the pleasure and happiness of getting the expected rain which was very much needed for his crops to have good yield. This shows that he was extremely happy by this event.