As Christians we don't only look to be rewarded here earth but the greater rewards which awaits us in heaven. We should be envouraged that our labour will not be in vain, for any little thing we do for God will be duly rewarded. Apostle admonised us this way:
Therefore, my beloved brethren, be steadfast, unmovable, always abounding in the work of the Lord, since you know that your labor is not in vain in the Lord. 1 Cor. 15:58