Two additional sayings on prayer are connected to 11:23 by the word believe.
In the first (11:24), we are told that we will receive what we ask for (see Matt 7:7) if we pray with the faith described in Mark 11:23.
Forgiveness is the second condition for answered prayer. Only when we forgive others can our most important prayer, that God forgive us, be answered (Matthew 5:23–24; 6:12, 14–15; Luke 6:37; 11:4; compare Luke 7:41–43, 47; Ephesians 4:32; Colossians 3:13).