There were in the days after the Resurrection, as well as today, those who disbelieve the Resurrection. Even among Christians there can be a tendency to not recognize the radical mystery of the Resurrection and what it asks of us. The Resurrection calls for us not merely to die to our sins but also to give up those things which we cherish most and so to gain Christ in the fullness of his glory.
Sometimes things happen in our lives that simply feel too good to be true. For me it was my ordination and religious profession. For you it may be the day you got married, or when your children were born. Maybe it was a day when you got a great job promotion, bought a new house, or accomplished a lifelong goal.