“Without inner love, all external works are useless. On the other hand, what is done out of love is great and produces abundant fruit, however insignificant and contemptible it may seem in the eyes of men. For, in God’s scales, what motivates you to act weighs much more than the action itself” (cf. Thomas à Kempis, The Imitation of Christ).
This is a key phrase for the spiritual life! Certainly, some of us have felt the desire to do great works for the Lord, and perhaps we are saddened when, despite our sincere efforts, we manage to accomplish only small works—or practically none at all—from our perspective.

