Let your reason be supreme.
Inculcate the habit of deliberation.
Practice the art of testing whether particular things are actually good or not. Learn to wait and assess instead of always reacting from untrained instinct. Spontaneity is not a virtue in and of itself.
If some pleasure is promised to you and it seductively calls to you, step back and give yourself some time before mindlessly jumping at it. Dispassionately turn the matter over in your mind: Will this pleasure bring momentary delight, or real, lasting satisfaction? It makes a difference in the quality of our life and the kind of person we will become when we learn how to distinguish between cheap thrills and meaningful, lasting rewards.
If, in calmly considering this pleasure, you realize that if you indulge in it you will regret it, abstain and rejoice in your forbearance. Reinforce the triumph of your character and you will be strengthened.