p198 If all the necessary atmospheric causes and conditions come together, clouds will appear. If these are absent, clouds cannot form.

If all the necessary atmospheric causes and conditions come together, clouds will appear. If these are absent, clouds cannot form. The clouds are completely dependent upon causes and conditions for their development; without these they have no power to develop. The same is true for mountains, planets, bodies, minds, and all other produced phenomena.

Venerable Geshe Kelsang Gyatso Rinpoche,
The New Eight Steps to Happiness