What does the Bible teach about human ability in relation to God's calls?

The dialogue between God and Moses in Exodus reveals the common human inclination to doubt one’s abilities when faced with God’s commands. Moses expresses his insecurities in Exodus 6:12, saying he is 'of uncircumcised lips,' suggesting he feels unfit for the task. However, God’s response illustrates that effectiveness in God’s work stems from divine empowerment, not human capabilities. 1 Corinthians 1:27 further affirms that God chooses the weak and foolish of the world to confound the wise. This highlights the Reformed belief that all who are called by God can trust He will provide everything necessary to fulfill His purposes.