What we have recorded in the four gospels are people who received from God according to their own faith.  They believed God and it was established.  That same faith came under attack where it became necessary for Jude to write and exhort the believers to contend for the faith that was once delivered unto the saints.  This book gives you eight different individuals who operated in faith to receive their miracles. This is a description of the faith we must contend to have in our lives.