The Pharisees and Sadducees came to Jesus and tested him by asking him to show them a sign from heaven. He replied,
… A wicked and adulterous generation looks for a sign, but none will be given it except the sign of Jonah.
Jesus then left them and went away.
Signs sent supernaturally by God are only needed in exceptional cases. Recognising Gods guiding hand in the ordinary course of life should be quite enough to help us trust in him.
Daily Reading: Numbers 5