Prime Minister Narendra Modi has expressed grief on the demise of veteran author and Gujarati columnist Father Carlos Gonzalez Valles SJ, popularly known as Father Valles.<br />'' <br />''<span style="color: #222222;">In a tweet, Mr Modi said, Father Vallés endeared himself to many, especially in Gujarat and he distinguished himself in diverse areas such as mathematics and Gujarati literature. The Prime Minister said, Father Valles was also passionate about serving society. </span><br />