Chinmayananda said consistent creative thinking is called tapas.
In Indian scriptures, various rishis (saints) and rajas (kings) were said to have done tapas and acquired great intellectual powers and military powers.
What is tapas? Explaining tapas as consistent creative thinking that is focused on discovery and invention makes sense. That is what now scientists are doing.
Creative thinking requires mental concentration. In the philosophical tradition, the mind is to be withdrawn from the sense-organs and focused on intellectual ideal.
This knol will be used to identify other references to tapas in Hindu scriptures.