They say: “Our hearts are concealed in veils from the faith to which you call us, there is deafness in ours ears and there is a barrier between you and us: so you work your way and we keep on working our way.”
Meaning:-
Conceal: to hide, to keep secret, to prevent or avoid disclosing, keep secret.
Veils: a piece of thin material worn by women to cover the face or head
barrier: block, obstacle, boundary of any kind.