Knowing it is good is not good enough...

We all know and admit that justice is good but there is need of volition and action to carry out and manifest it. For example, we might think it good to build a church but simply thinking of it as a good thing will not help its erection. The ways and means must be provided; we must will to build it and then proceed with the construction. All of us know that international peace is good, that it is conducive to human welfare and the glory of man but volition and action are necessary before it can be established. Action is the essential. Inasmuch as this century is a century of light, capacity for action is assured to mankind. Necessarily the divine principles will be spread among men until the time of action arrives. Surely this has been so and truly the time and conditions are ripe for action now. All men know that verily war is the destroyer of human foundations and in every country of the world this is admitted and apparent.

'Abdu'l-Baha, Foundations of World Unity, p. 26

Attainment of any object is conditioned upon...

The attainment of any object is conditioned upon knowledge, volition and action. Unless these three conditions are forthcoming there is no execution or accomplishment.

'Abdu'l-Baha, Foundations of World Unity, p. 100

All that we potentially posses can be manifested only as a result of our own volition

Know thou that all men have been created in the nature made by God, the Guardian, the Self-Subsisting. Unto each one hath been prescribed a pre-ordained measure, as decreed in God's mighty and guarded Tablets. All that which ye potentially possess can, however, be manifested only as a result of your own volition. Your own acts testify to this truth.

Baha'u'llah, Gleanings from the Writings of Baha'u'llah, p. 149