A strong believer is better and more beloved to Allah than a weak believer–however, there is goodness in every (believer). Be eager for (and strive after) what benefits you and seek help in Allah. And do not be too weak or lazy to do so. [Muslim] (033:6441)
(Al Nawawi notes that the meaning of “strong” in this hadith is, “of strong resolve, one whose mind is intent on the affairs of the Hereafter.”)