Discernment is a way of life! We are constantly having to decide between two good things. Here is a prayer for discernment attributed to St. Basil of Caesarea in the 4th century.
Steer the ship of my life, good Lord, to your quiet harbor, where I can be safe from the storms of sin and conflict.
Show me the course I should take. Renew in me the gift of discernment.,
So that I can always see the right direction in which I should go.
And give methe strength and the courage to choose the right course,
Even when the sea is rough and the waves are high,
Knowing that through enduring hardship and danger we shall find comfort