Faith. The most important faith that we must have is and always will be, God, to have God in our hearts will open the doors that will allow us to carry out all the challenges that may arise.
The faith in being able to execute our actions will depend on the capacities that we have to be able to carry out everything that we propose, as it is well explained in his example.
To have these skills, we must implement (at least I do and believe in that), a work plan that allows to develop and have control over them, to, from that moment, have faith in ourselves, power, be sure that Our capabilities can successfully develop the activities we are running. This plan is the Deming Circle or PDCA cycle.
It is important to believe in ourselves and, for this, we must work constantly.