"If you can't be a highway then just be a trail"

The poetic line is from the poem

"And in the valleys I have observed your tranquility"

'I' refers to

Reaping and Singing by herself stop here, or gently pass!

-Wrote the above poetic lines.

Gokhale's motivational speech, addressing the students was delivered in Mumbai in July

"Into the dreary desert sand of dead habit"

These words occur in the poem of

"The highest result of education is tolerance" - identify the speaker.