Before his enlightenment the Buddha almost died, while he was pushing ascetic practices to the very limit. Fortunately, a revolutionary insight saved his life: Not all pleasure has to be rejected. Only sensual happiness or any form of pleasure connected with unwholesome phenomena is an obstruction, but the spiritual happiness that is beyond sensuality has to be deliberately developed as a support on the path to Nibbāna.
The Buddha referred primarily to the rapture & bliss that can be experienced in Samādhi, but there are other forms of spiritual happiness that we can develop even at the less advanced stages of our practice: Generosity; Rejoicing in the generosity of other beings; Paying respect & expressing devotion to those worthy of respect; Noble Friendship; Listening to and studying the Dhamma; Developing Virtue ('Anavajja Sukha = Blameless Happiness'); Sense Restraint ('Avyāsekha Sukha'='Unsullied Happiness') ...
Ajahn Dhammasīha encourages us to devolop these manyfold forms of non-sensual, spiritual happiness. He explains how we use mindfulness to recognize and correctly identify which feelings are wordly and which are spiritual ('Satipaṭṭhāna', 'Vedanānupassanā'='Contemplation of Feelings'), and then deliberately develop only the spiritual happiness.
Rather than being stuck on the misleading adage "No pain, no gain", we follow the Buddha's advice and develop happiness by means of pleasure, - only that it has to be the right kind of pleasure. ('Sukhena sukhaṃ adhigantabbaṃ'='Gaining happiness by means of happiness')