Theory:

He won’t do what you tell him.
So, come, let’s build strong homes,
Let’s joint the doors firmly.
Practise to firm the body.
Make the heart steadfast.
Do this, and the wind will be friends with us.
Explanation:
 
"He" refers to the wind. He will not do what we tell him to do. So what can be done? The weak can strengthen themselves to fight against the wind. So the poet asks us to build stronger homes and fit the door firmly. He also asks us to keep our bodies fit and firm by working out. He tells us to make our hearts firm, strong and unwavering. We should do all of the above to make a friendship with the wind, as we do not have any other choice.
 
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Let’s joint the doors firmly; Practise to firm the body!
 
Since Bharati wrote this poem during the pre-independence era, it was also a call-out to reinforce themselves to fight the British more strictly. It may also mean building ourselves stronger mentally and physically to face hurdles and problems and succeed in life.
 
Meaning of difficult words:
 
S.No
Word
Meaning
1
Steadfastresolutely or dutifully firm and unwavering
Reference:
National Council of Educational Research and Training (2006). Beehive. Wind - A.K.Ramanujan (pp. 30-31). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.