This invariably wins them the love and respect of others,for

句子成分分析：
【This主语】【 invariably wins谓语】【 them 间接宾语】【the love and respect of others直接宾语】,【for they add colour to the dull routine of everyday life.原因状语从句】
for 【they从句主语】【 add谓语】【 colour宾语】【 to谓语动词的一部分】【 the dull routine of everyday life介词to的宾语】
句意：这一定会为他们赢得别人的尊敬和爱戴,因为他们为这枯燥的日常生活增添了色彩.