The mystic ladder of Divine love, according to Saint Bernard and Saint Thomas Step three

3. The third step of the ladder of love is that which causes the soul to work and gives it fervour so that it fails not. Concerning this the royal Prophet says: ’ Blessed is the man that feareth the Lord, for in His commandments he is eager to labour greatly.’ Wherefore if fear, being the son of love, causes within him this eagerness to labour,[Lit., ‘makes in him this labour of eagerness.’]
what will be done by love itself? On this step the soul considers great works undertaken for the Beloved as small; many things as few; and the long time for which it serves Him as short, by reason of the fire of love wherein it is now burning. Even so to Jacob, though after seven years he had been made to serve seven more, they seemed few because of the greatness of his love.

Now if the love of a mere creature could accomplish so much in Jacob, what will love of the Creator be able to do when on this third step it takes possession of the soul? Here, for the great love which the soul bears to God, it suffers great pains and afflictions because of the little that it does for God; and if it were lawful for it to be destroyed a thousand times for Him it would be comforted. Wherefore it considers itself useless in all that it does and thinks itself to be living in vain. Another wondrous effect produced here in the soul is that it considers itself as being, most certainly, worse than all other souls: first, because love is continually teaching it how much is due to God;[Lit., ‘how much God merits.’] and second, because, as the works which it here does for God are many and it knows them all to be faulty and imperfect, they all bring it confusion and affliction, for it realizes in how lowly a manner it is working for God, Who is so high. On this third step, the soul is very far from vainglory or presumption, and from condemning others. These anxious effects, with many others like them, are produced in the soul by this third step; wherefore it gains courage and strength from them in order to mount to the fourth step, which is that that follows.