初心

Noun

 * 1) one’s initial intention; original idea; true feelings; aspiration; purpose; goal; mission
 * 2)  mind of a novice, an attitude to learn resembling that of a beginner's, possibly in spite of one's mastery
 * 1)  mind of a novice, an attitude to learn resembling that of a beginner's, possibly in spite of one's mastery
 * 1)  mind of a novice, an attitude to learn resembling that of a beginner's, possibly in spite of one's mastery

Etymology
From +.

Adjective

 * 1) immature, naive

Noun

 * 1) immaturity, naiveté
 * 2) original intention, original object
 * 3)  open, eager attitude to learning, as if one is a beginner