You can refer to a passage written by Marx in middle school. Very touching and inspiring, which is different from the dry teaching in the later period.

The following is the original text:

If we choose a career that can best work for mankind, then the burden cannot overwhelm us, because it is a sacrifice for everyone; At that time, we didn't enjoy poverty, limitation and selfishness. Our happiness will belong to millions of people. Our cause will exist silently, but it will always play a role. In the face of our ashes, noble people will cry.