The arising of a fruit, such as an apple, depends on many conditions. If those conditions are not met, no fruit is to be found.
Can the same be said about our practice?
What is the fruit that we are looking for? What are the conditions necessary to give rise to such a fruit? If such a fruit depends on conditions, is it lasting? Will we be satisfied?
These are actually really hard questions to form answers around. Sit with them and work them over. Let them work you over.
Then ask yourself, what can I rely on?