思无穷念无邪
[sī wú qióng niàn wú xié]
This can be translated into 'Limitless Thoughts, Without Ill Intentions' - a combination of introspective contemplation and the purity of heart. This Chinese saying suggests deep thinking without harboring ulterior motives; it implies wisdom and clarity of thought along with innocence, suggesting intellectual depth while retaining childlike sincerity.