irAmalinga aDikal who is more famously known as vaLLalAr has composed many songs on the God. His preeching is jIva kAruNyam (mercy to fellow lives) and his slogan is aruT perunychothi thanipperunkaruNai. (Supreme Grace Splendor, Supreme Unique Mercy)
There are orthodox shaiva siddhanta sections who hold a different view with respect to the philosophies of vaLLalAr. But the devotion he had for God, respect for devotees and kindness towards all the lives is much respected. Here are the vaLLalAr songs arranged in order.