power he did not try,
His hands and feet too opened no tie.
The wisdom to man is sometimes a chain,
If he had no heart2 to check and restrain.
Nairoo (ru); control, power, force, mastery.
2. Heart; here it means flame of love, his attention.
Basic thought:- (as inherent here) that heart alone can get freedom from intellect, because intellect itself is a slave to love.
See the above thought in the following verse of Iqbal A freeman I am, love is my guard,
Love is my guide, and wisdom my ward.