My mother pointed out the ideal and aroused mine. However, my childhood knowledge was superficial after all. There is a sea beyond the mountain. Once I can't see the sea, I still see the mountains, so I'm disappointed.
(2) When the author grows up, he understands that the sea my mother said is a sea of faith. Although it is still far away, it is not illusory. Ideals and beliefs make people not afraid to travel long distances and' walk with confidence' again and again.
The poet tells people with his own life feelings and firm beliefs that the road to an ideal life is long, but as long as he persists in struggle, the ideal realm will eventually be realized.
Theme: This poem expresses a belief and a philosophy. Poets use the sea as a metaphor for ideals, mountains as a metaphor for all kinds of difficulties, and climbing mountains as a metaphor for hard struggle, thus telling people that the road to ideals is long and rugged, and to reach the ideal state, we must be fearless.