UGC NET English Q141

Question

Direction for 141 to 145:
Well, son, I'll tell you:
Life for me ain't been so crystal stair
It's had tacks in it
And splinters
And boards torn up,
And places with no carpet on the floor -
Bare.
But all the time
I'se been a'climbin' on,
And reachin' Landin's,
And turnin' corners,
And sometimes goin in the dark,
Where there ain't been no light
So boy, don't you turn back;
Don't you set down on the steps
'Cause you finds it's kinder hard;
Don't you fall now -
For I'se still goin', honey
I'se still climbin',
And life for me ain't no crystal stair.
What advice does the speaker give to his/her son in the poem?