How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in your life you will have been all of these.

This quote means that how successful you become in life depends on how you treat people at different stages of their life. You should be kind and understanding towards young people, have compassion for elderly people, and be supportive and open-minded towards those who are facing difficulties or have achieved success. This is important because at different stages of your own life, you too will have been in similar situations.