That would be slokha or stanza from Chanakya an ancient Indian sage

In the original sanskrit it would read like….

मनसा चिन्तितं कार्यं वाचा नैव प्रकाशयेत्। मन्त्रेण रक्षयेद् गूढं कार्य चापि नियोजयेत् ॥

The english pronunciations would roughly come as

Manasa chintitam kaaryam vacha naiv prakashayet
Mantreyn rakshayed goodham kaarye chaApi niyojayet 

And the all important meaning is …

Whatever the mind has contemplated, should not be expressed from the mouth. Thinking it over, it must be kept a secret and without announcing the thought, it must be implemented in action

Have followed this principle through out my adult life. Do not justify my actions or talk about it to all instead implement it through my actions.

Yes indeed! Spent months in the foothills of the Himalayas, some decades back. Lived in tents in a valley of flowers. Woke up to a view of sun rising revealing the Everest and some of the tallest mountains on this planet. Snow draped mountains, clean air, time stood still there.
Best time of my life.

Early morning hours. Can feel the energy till noon then feel sleepy.