The church in first-century Philadelphia received a wonderfully favorable letter from Jesus (in Revelation 3:7-13). While Jesus’ affirmation, “I know your works,” in the other letters was not necessarily a “good thing,” what Jesus observed and knew regarding these brethren was delightfully commendable. Jesus had, therefore, opened a door of opportunity to them that no one could shut, for He had great confidence in them and knew they had “a little strength” (3:8).
A little strength? How can that be a good and commendable thing? It is uncertain if this was a 
reflection of their small numbers, their limited financial means or their lower social standing (all of which are possible). Regardless, Jesus assured them and encouraged them that “they could do it!” There have been other Christians, who “out of weakness were made strong” (Heb. 11:34), because His people “can to do all things through Christ who strengthens” (Phil. 4:13).
Jesus knows you and your potential! Even if you feel you have “a little strength,” that is enough for the Lord to take, use and even make stronger, if you’ll give it to Him and use it for Him!